**Actually there are 115 episodes to my knowledge but they have either not been translated/dubbed into English yet!
Episode 1 -
Hamtaro Hamtaro, the curious pet hamster of 5th grader Laura, sets out to meet his neighbors after they move to a new town. While Laura enjoys a snack with her parents, Hamtaro sneaks down the drainpipe and meets his hampster neighbor Oxnard. Later, the two of them meet up with Boss and Bijou. That night Laura tells Hamtaro about her new friend, Kana, Whom she met while buying hamster stationery at the store.
Episode 2 - The Ham-ham Clubhouse On Laura's first day of school, Hamtaro proves useless in helping Laura find the perfect outfit, but decides to show his support by keeping an eye on her at school. He soon gets sidetracked when he runs into his new friends Oxnard and Boss who introduce him to more hamster pals. Later, Boss escorts them to his hideout, where Hamtaro suggets that it become the new Ham-ham Clubhouse.
Episode 3 - Calling all Ham-hams Since the opening of the Ham-ham Clubhouse, Hamtaro is meeting new hamsters every day and with all the new hamsters come ham-personalities that clash. One day when this happens, a fed up Boss throws everyone out. In the meantime Laura gets a perfect score on her math test, but her parents are too busy to hear about it.
Episode 4 - Come out Bijou During summer vacation, Laura goes to feed the guppies at school and accidently spills water all over her skirt. Travis, a handsome boy that Laura secretly admires, lends her his towel. Meanwhile across town, another budding romance is stalled because Bijou, the love interest of Boss, will not visit him at the clubhouse.
Episode 5 - Diamonds of Sugar While listening to Laura and Kana plan an evening barbecue, Hamtaro becomes enchanted by what the girls are eating, a sparkling candy called Diamonds of sugar. Puzzled, Hamtaro goes to the Ham-ham Clubhouse to ask his friends if they've heard of it. After many theories, Boss insists the candies come from the sky, so the hamsters set out to catch some candy.
Episode 6 - First time at the Beach When Laura's parents take her to the beach for the first time, Laura plans to leave Hamtaro behind after her parents tell her that the water can be dangerous for hamsters. Hamtaro and the ham-hams feel they must see the ocean and agree to stick together for safety. Laura meets up with Kana and they go off to a secluded place to swim, but then it begins to rain and they take shelter in a cave. Hamtaro and his friends hide under Laura's hat and then help Laura's father to locate Laura and Kana.
Episode 7 - A Summer Festival Adventure Laura goes off to meet her friend Kana at the Summer Festival and a confused Hamtaro follows behind, trying to figure out what a festival is. Soon he meets up with Maxwell, Boss, and Pashmina, and the book-smart Maxwell explains that at festivals, flowers bloom in the sky. Hearing this, Pashmina goes off to look for the flowers and gets lost from the group.
Episode 8 - The Sunflower Field Hamtaro goes with Laura and her family to visit their Grandma in the country. The ham-hams get very excited for Hamtaro when he tells them that sunflower fields surround Grandma's house. After the family arrives, Hamtaro realizes that Boss has hitched a ride to enjoy a day among the hamster delicacy, the sunflowers.
Episode 9 - Much Ado about School After Laura starts a new semester, the ham-ham pals start to wonder if they might be missing something by not going to school. So after Hamtaro, Oxnard and Boss sneak into Laura's school for a day to check things out, the ham-hams set up a separate school of their own.
Episode 10 - Jingle the Wanderer Laura's father asks her to deliver an important floppy disk to his office. While Laura packs her bag, Hamtaro gets trapped inside. on the way to Mr. Haruna's office, Hamtaro picks up two hitchhikers, Oxnard and Penelope, who have just escaped from an angry crow. When Oxnard's sunflower seed falls to the ground, so does the yellow disk.
Episode 11 - The Wise Elder-Ham It's Grandparent's Day and Grandma comes for a visit and shows Laura an old clock that she and her friend Kaitlyn bought years ago. Laura decides to surprise her Grandma by trying to find her long-lost friend. Hamtaro soon gets wind of this plan and asks his ham-ham friends to help out.
Episode 12 - Bijou's in Danger When Laura and Kana go shopping, the ham-hams decide to go along but soon find danger in the shopping district. A mean cat lives in the alley and after Bijou goes back there, she doesn't return. The ham-hams attempt a dramatic rescue before Laura and Kana show up. It turns out that the cat is a mother and was only trying to protect her kittens.
Episode 13 - Let's Dance Sandy Hamtaro and the ham-hams are rehearsing for their performances in Elder-ham's Annual Sunflower Seed Harvest Festival. Boss is studying for the lead role in a play and the ham-ham girls are practicing their gymnastics routine. Sandy, the agile athelete of the group, has a big crush on Maxwell, who reminds her of her long-lost twin brother. Sandy asks Hamtaro to see if Maxwell feels the same about her.
Episode 14 - The Search For Sandy's Brother The ham-hams hold a meeting to begin searching for sandy's twin brother but quickly become daunted by the large task. In the meantime, Laura and Kana spend time with Sandy's owner, Hillary, who introduces them to Noel, an instructor at the gym. They soon find out that Noel has a hamster named Stan. Could Stan be Sandy's long-lost twin? Yes, Stan is Sandys long-lost twin, and is a big flirt who can dance..
Episode 15 - Bijou's Favorite Ribbon On a school trip, the handsome Travis doesn't notice Laura's pretty hair ribbon that she wore just for him and she is heartbroken. At the Ham-ham Clubhouse, Hamtaro uses Bijou's favorite hair ribbon for a blindfold in "blind man's bluff," and Bijou is furious.
Episode 16 - Get Well, Laura Laura isn't sleeping well these days because her energetic hamster Hamtaro is playing in his cage after hours. Meanwhile in the Ham-ham Clubhouse, Boss has developed a stomachache. The wise Maxwell suggests that Boss eat some yogurt for his belly. But when they go to Hamtaro's to get some, Hamtaro forgets where it is.
Episode 17 - Hamtaro, The Super Sleuth! There is a thief at Laura's school and also in the Ham-ham Clubhouse! Hamtaro starts an immediate investigation and soon discovers many of the stolen items under Boss' bed. Boss declares his innocence, but the evidence makes it hard for the ham-hams to believe him.
Episode 18 - The Slipper Chase When Laura is asked to perform the role of Cinderella in the school play, the nervous actress accidently leaves one glass slipper at home. When Hamtaro discovers the lost slipper, he and his ham-ham friends set out to secretly deliver the slipper to the theater.
Episode 19 - Panda's Ham-ham Fun Park When Laura goes off to the amusement park with her dad, Hamtaro tells his pals at the clubhouse and they decide they want to build an amusement park of their own. Panda brags that it's something he's always wanted to do and even shows them blueprints. The other hamsters like the idea and start working with Panda.
Episode 20 - The Snoozer Mystery During spring-cleaning at the clubhouse, the ham-hams can't wake up Snoozer, so they haul him outside on a table and leave him with the rest of the furniture. Then a remote-controlled car, powered by two boys, crashes into the desk and carries him away. When Maxwell arrives with a missing hamster poster, the sherlock ham-hams set out to solve the Snoozer mystery.
Episode 21 - Courage Cappy Despite having a happy hamster life and being loved by his owners, young Cappy feels restless and decides to leave home. He starts hanging around Boss' house and romanticizing about the free and solitary life of a field hamster. The ham-hams ponder whether or not they should let Cappy experienece being a field hamster or talk him out of his plan.
Episode 22 - Pashmina's Present As Laura grapples with what to give Travis for his birthday, Hamtaro shares the information with his ham-ham friends and proclaims: "it seems that tomorrow is the day to give a present to someone you care about." Dexter and Howdy like this idea and decide to give Pashmina a gift.
Episode 23 - Maxwell's Big Scoop! When Laura gets assigned to write for the school paper, the ham-ham friends are excited about starting their own paper, The Ham-ham Times. Maxwell is appointed the chief editor and the hamsters all become reporters looking for the big scoop. Soon, Hamtaro and Oxnard discover a great story -- the lake in the park is frozen over. Then Stan decides he will go across and look at an island, then all the ham-hams decide to go but Boss trips and breaks the ice. Now stranded on the island, they begin to blame each other, but then Maxwell thinks to build a raft and they get back safely.
Episode 24 - Hamtaro, Please come Home Laura takes Hamtaro for a walk and wears her new favorite red ribbon. Suddenly the red ribbon blows off Laura's head and lands in a box on a transport truck. Hamtaro jumps into the box to rescue it and gets whisked away. The truck takes Hamtaro into the deep countryside and when it hits a bump, he and the ribbon fly out the back. The hamster network gets in gear to try and find Hamtaro.
Episode 25 - Merry Christmas Christmas is almost here and all the hamsters can think about is what presents they want. Everyone but Boss, that is, who has never recieved a present for Christmas. When he hears that Santa gives gifts to hamsters who are good he works at being a good hamster. The other hamsters see this effort and decide to tell Santa about Boss.
Episode 26 - The Legend of the Courageous Hamtaro Laura reads a fairy tale to Hamtaro and in the middle of the story they both fall asleep and start dreaming. Laura dreams that she lives in a lovely castle protected by Ham-ham Knights. Hamtaro becomes a noble hamster who rides the dog Brandy through the sky and defeats the Wicked Ham-Wizard. Laura and Hamtaro wake up happy, having shared the same dream.
Episode 27 - The Snow Storm After a snow storm, Laura and Kana decide to go ice skating. Hamtaro isn't thrilled about being in the cold, but after he recruits his ham-ham friends he knows he'll have a good time. Boss and Stan decide to have a showdown to determine who is the "King ham of the snow" and soon all the ham-hams are engaged in a snowball fight.
Episode 28 - The Amazing Auntie Viv There is a marathon race at Laura's school and a friend of Elder-ham's, the eccentric Auntie Viv, comes to town to participate. When the race begins, Auntie Viv and an equally competitive Boss charge out of the starting gate. When Laura stumbles, all the hamsters learn a lesson about good sportsmanship from the dashing Travis.
Episode 29 - The Search for Dad's Glasses After Laura's father loses his favorite pair of eyeglasses, she and Hamtaro accompany him to the optical shop for a new pair. After trying on several, a frustrated Mr. Haruna decides to keep looking for his old glasses. Dexter, the hamster who lives in the optical store, persuades Hamtaro to help out with the search.
Episode 30 - Brandy's Big Race Hamtaro and the family dog, Brandy, go with Laura to a dogsled race. Brandy begins to worry about embarrassing Laura with his laziness, so he decides to sign up for the race. Everyone is impressed with Brandy's initiative, but soon he becomes a laughingstock when the other dogs race ahead. The ham-hams cheer him on to the race's dramatic conclusion.
Episode 31 - Boss is a Mom Boss, the self-appointed chief of the ham-ham clubhouse, is acting strange lately, and the other ham-hams are concerned. Deciding to follow him, they soon discover that he's caring for an abandoned kitten. The ham-hams support Boss in his efforts until they find out that the kitten belongs to a girl named Mia, one of Laura's classmates. Will Boss give up the kitten so easily?
Episide 32 - Valentine's Day On Valentine's Day, Laura decides to make chocolates for Travis. In the Ham-ham Clubhouse, the traveling Auntie Viv appears, wanting to give a Valentine gift to Elder-ham. Inspired, the girl hamsters give nuts to all the boys and the clubhouse comes alive with Valentine's fun. Things are not as fun in Laura's world, however, when she loses her nerve to show her affection for Travis.
Episode 33 - Let's Cross the Rainbow Laura's good friend Kana is in the hospital on a dreary, rainy day. When the sky clears after the storm, a beautiful rainbow appears in the sky. Laura wants her friend to see it, but as much as Kana looks she can't find it. At the Ham-ham Clubhouse, Bijou is looking for the rainbow, too, and the doting Boss promises to find it and take her for a walk across it.
Episode 34 - Watching Over Cute Penelope Pashmina is going out for the day without Penelope, so in an attempt to impress Pashmina, Dexter and Howdy volunteer to baby-sit so penelope won't be alone. howdy and dexter, both competing to be the best baby-sitter, end up fighting with each other and a neglected Penelope wanders away. When they discover her missing, the other ham-hams launch a frantic search.
Episode 35 - Yahoo! It's Girl's Day It's almost Girl's Day, a day just for girls. As the hamsters are trying to understand the holiday, they find themselves following a girl named Mimi down the street because she is carrying one of their favorite foods, rice crackers. They follow her to Panda's house, where she invites the ham-hams in to celebrate.
Episode 36 - Farewell, Bijou! When Maria, the owner of Bijou, decides to go back to France to study piano, Bijou must bid her ham-ham friends good-bye. The hamsters are in shock. Boss is so broken-hearted that he stops eating and takes to his bed. As the day approaches, the ham-hams decide to be strong and have a memorable good-bye party for her.
Episode 37 - Oxnard's Big Crush Kana's cousin Dylan lives on a farm called The Flower Ranch with his parents and his pet hamster, Pepper. Kana and Laura, along with their families, decide to visit Dylan. On the way, Oxnard reveals that he has a huge crush on Pepper. Hearing this, Hamtaro encourages him to tell her about his feelings that very day.
Episode 38 - The Precious Letter When Mr. Haruna plans a business trip to their old town, Laura hopes to reunite with her old friend Melanie. Laura fails to reach Melanie by phone, so she decides to send a letter. But Laura never gets a reply so a curious Hamtaro takes it up at the clubhouse and says he wants to investigate. Jingle and Boss agree to solve the mystery.
Episode 39 - The Flying Ham-hams Hamtaro wants to learn to fly after Jingle relays "The Tale of the Flying Hamster." When a scroll about his special hamster is found in Panda's house, Hamtaro's determination increases even further. In the meantime, Laura is trying to decide on a flower design for a school project and goes to the park, allowing Hamtaro time to persuade his ham-ham pals to join his new adventure.
Episode 40 - The Blossoms Friendship The families of Laura and Kana go to the park to see cherry blossoms. All the ham-hams decide to go along, including Bijou, who has never seen the colorful buds, at the last minute, however, Bijou is unable to go, so all the other ham-hams(except a broken-hearted Boss) go without her, eventually the ham-hams hatch a unique plan to go to Bijou's house and show her what cherry blossoms look like.
Episode 41 - The Scary Museum! The ham-hams follow Laura to a local museum when she goes there for an independent study project. Hamtaro sees that Laura is preparing lunch for her special guy, Travis, so the ham-guys decide to do the same for their girls. Dexter and Howdy bring lunch for Pashmina and a smitten Boss brings some nuts for the elegant Bijou.
Episode 42 - Welcome Pepper Dylan and Pepper are coming to town for a visit. Kana and Laura think long and hard about how to entertain their friend. oxnard, a big fan of pepper, makes some plans as well. Since Pepper has never been to the city before, Oxnard will volunteer to show her around.
Episode 43 - The Great Chicken Chase When Laura and the other students study zoology in Mr. Yoshi's class, everyone brings their pets to school. While the animals play, Oxnard strays off to look for food. He finds some corn and starts eating it, but then realizes he's in the cage of the mean chicken trio: Gonzales, Vinny and Capone.
Episode 44 - I Love my Grandpa! On Children's Day, Laura's Grandpa comes to visit, bringing with him his latest invention, a mini-mechanical car. He decides to test it on Hamtaro and before long, the car throws Hamtaro across the room. Laura gets upset with her Grandfather and leaves the house, so Hamtaro rallies the ham-hams to find a way to bring the two back together.
Episode 45 - Ham-ham Gang at the Aquarium Laura begins reading Hamtaro a fairy tale, but falls asleep before she can finish. The next day, Laura and Kana go to the aquarium with their fathers and the ham-hams follow along. Inside the aquarium, the hamsters are overwhelmed by the sea creatures, but Hamtaro recognizes it as the place from the fairy tale that Laura read the night before. Thus begins an interesting adventure.
Episode 46 - The Sports Festival Laura and Kana are participating in a parent-child triathlon with their fathers. The ham-hams decide that they want to organize a competition of their own, so they attend the Sports Festival to see what's involved. Oxnard gets so excited rooting for Kana and her father that he starts running after them. Boss and Hamtaro follow along and pretty soon all the hamsters are tangled up in the race.
Episode 47 - The Romantic Set-Up Mr. Yoshi, Laura's teacher, cannot forget a beautiful woman he has met named Charlotte, so the ham-ham girls set out to find her. It turns out Charlotte comes from a wealthy home and has a domineering father who is trying to arrange a special meeting to introduce her to "the right man," Chad Baldwin. The girl hamsters decide to intercept his invitation and deliver it to Mr. Yoshi instead.
Episode 48 - Ham-ham Clubhouse in Danger During the rainy season, the ham-hams begin to long for a change of atmosphere so they decide to redecorate the clubhouse. After they finish, they try to go outside but find that the door won't budge because a mole has dug a hole while they were decorating!
Episode 49 - In Search of the Pendant After Laura and her parents have an argument, Dad leaves the house with Laura. As a worried Hamtaro watches them go, the ham-poet Jingle appears. In the meantime, Laura and her Dad go to the department store and buy her Mom a pretty pendant for Laura's parents' anniversary, but when they get home, Laura discovers the pendant is missing.
Episode 50 - Even the Ham-hams Get Seasick Laura's social studies class takes a field trip to the harbor to ride a sightseeing boat. Boss claims to be an expert on boats and harbors, so the hamsters follow along. When they get there, however, they soon realize that Boss has never been near a boat or harbor in his whole hamster life.
Episode 51 - Stan and Sandy Make-Up Hamster siblings Stan and Sandy have one of their heated arguments and the ham-hams decide that the twins need to make up, so they plan a surprise party for their birthday. Using a plan drawn up by Panda, the hamsters make a special birthday cake of fruit and yogurt. Will it be enough to make Stan and Sandy forgive each other?
Episode 52 - It's Robin Ham Snoozer sleeps so peacefully that no ham would know how busy his dreams are. In one dream, the ham-hams are in a castle town and Robin Ham(played as Hamtaro) is going to Chick-ah Chick-ah Castle to visit the sick father of maiden Laura. The Miser, played as Howdy, has also just arrived.