Agumon digi-volved to Greymon (a huge T-Rex type of digimon) to save Tai and the group. Shellmon was no match for Greymon's "Digi-Nova-Blast!" Right after blasting Shellmon to the horizon, Greymon digi-volved back to Agumon.
The episode starts off with the group all standing on a cliff. Tai has a thoughtful expression on his face, he's recalling the epic battle between Shellmon and Greymon. "Hey Agumon, I kinda like it when you were Greymon; no offense. Why don't you just stay that way?" Tai askes. Agumon cannot stay as Greymon. "Even superheroes need rest, Tai" Agumon explains.
They here a nasty snarl. They all turn around and see Monochromon. The screen zooms in on Monochromon, and it's name is on top in green lime colors. It's a Triceratops-like digimon, but more metallic. Tentomon explains that Monochromon is a laid back digimon, but it can be a bit upset when hungry. Monochromon opens it's massive jaws and lets out a growl. It starts it's way towards the group.
The group look behind to find a way out. They're surprised to see another Monochromon there. "Caught between a rock and two sets of teeth!" Matt comments. The two Monochromon start charging at each other. Everyone quickly scrambles behind the rock. The Monochromon dukes it out with each other. But why? Tentomon understands now, they're fighting over terriotory. The group all start to run away, as far away from the Monochromon as possible. TK suddenly stumbles and falls to the ground. Matt rushes him and hurries him along. While this is happening, the Monochromon are literally biting each other. One Monochromon is biting the other's tail. They collide with horns ablaze. Eventually they fall over the cliff and fall into the water below.
"My feet hurt," Mimi complains. Izzy observes that they're losing their light source and they better find a place to camp. Tentomon senses water, and flies ahead to check it out. He reports it's a lake with fresh clean water and a variety of tasty fish. It'll make a great campsite. Gomamon can't wait to swim and starts to run forward, Joe grabs his tail and warns him to make sure it's safe. The group arrives, in the middle of the lake they see electical poles but they aren't connected to anything. When they start to argue where to sleep, they see a bus perched on top of a huge rock 'island'. The lights of the bus suddenlt blink on. They all decide to go in and examine the bus, to check for people. Nobody is in the bus. Izzy notices that how clean the bus is. The group spreads out to find food.
Bubbles appear in the water and Gomamon's head pops up and smiles and wades in one direction. Izzy and TK are fishing right next to him. "Gomamon stop playing in the water, I can't catch any fish." Izzy says. The screen cuts to Tentomon, he's collecting berries. Below him are Agumon and Patamon. Patamon's on Agumon head and prepares for one of his powerful gusts of breath. He blasts it and knocks a fruit out of a tree right on top of Gabumon's horn. Biyomon laughs and goes off to pick fruit off a tree. Palmon warns Mimi she's picking bad mushrooms that will make her sick.
Back at the campsite, Sora, Matt and Tai are finished making a campfire. How will they light it? Agumon helps out with his fiery breath. "Wow Agumon, your the man!" Tai comments excitedly. Agumon blushes. Izzy and TK caught a lot of fish. Tai grabs one and holds it over the fire to cook and does a little dance to dodge the flames. Matt sticks a stick through the fish and steadies it over the fire. "How you come up with an idea like that Matt?" Tai askes. "Cause I'm the man," Matt says.
The fish grow crispy and everyone chows down. TK says he only eats fish sticks, Matt says he won't tell. TK doesn't want to eat with his fingers because Mom doesn't let him. "TK it's alright," Matt says, annoyed. "Your with the big boys now, " Tai jokes. TK bites into the fish.
Tai walks over to Sora, who's getting water. They discuss how Matt doesn't treat TK like a brother but more like a bother. "Matt's just learning to be a big brother," Sora explains. Joe walks in staring at the sky. He can't seem to find the North Star. Sora doesn't recognize any of the constellations either. Tai reminds them, that their forgetting their astronomy. If you can't see the North Star, you're in the Southern hemisphere. Could they really be?
After their dinner, the Digimon are all tired and going to sleep. Izzy suggests someone stay guard. Everyone stands guard for one hour. Matt jumps up and says, "Not TK." TK whines, he wants to stand guard. "You are too young and you need rest." Matt argues.
Mimi complains, she's cold and wants a warm blanket. Tai looks and Gabumon menacingly. He holds Gabumon's loose fur and says, "Hey Gabumon, Mimi might sneak up on you. She might steal your fur. So if you feel a little tug, it might be her trying to snip your tail off!" Gabumon is offended and replies, "Stop it Tai! It's not funny," and Gabumon runs off. Matt gets angry and shoves Tai away. "Why'd you do that?" Tai says. "Gabumon said stop it," Matt shoots back. They both grab each other's shirts and looks angrily at each other's eyes. "Hey guys! Stop fighting!" someone cries. They both release each other and turns around, back to back. Joe says to both of them they would make great guards, who'll start first? They both want to. Joe makes up a schedule of guard, Tai will stand guard first. They all slowly go to sleep.
Matt instructs Gabumon, "go over and go lay down with my brother." Gabumon asks "why?" Matt hides his feelings and doesn't want anyone to know about them. "Your fur's making me sweat!" Gabumon knows that Matt wants him to keep TK warm, Matt just doesn't want to show it. He goes over and cuddles with Gabumon. TK notices the warmth and thanks Matt, TK sleeps. Matt turns around, face all red. He's embarrasses that he showed his feelings. He steps outside to get some air.
Tai's with Agumon, they're sitting beside the fire. Tai just can't keep his eyes open. He goes over to the lake to splash some water on his face. He steps over a red material in the ground. The red material wiggles and settles. Bubbles appear in the water and settle. No one notices. At the edge of the island, Tai is splashing water in his face to keep warm. He notices someone behind him. "Who's there?!" Tai asks. Tai notices Matt standing there. Matt apologizes for what happened after dinner. He explains how coming to a new world and looking after TK is so hard, and that he's stressed. "Don't you guys even live in the same house?" Tai asks. "Not anymore. We're half brothers. We don't see each other much." Matt explains. Tai understands now, Matt runs over the beach (off the rock 'island') Tai returns to Agumon and comments on how wierd Matt is.
At the beach, Matt sits against a tree. He plays on his harmonica, a vivid tune. Gabumon is with him and says "what a wonderful sound." In the bus TK hears it too and gives a tired smile. He gives a sigh and goes back to sleep, pleased to hear his big brother's lullaby for him.
Tai warns Agumon to be careful of the fire sparks. A spark hits the red material on the ground. The rock 'island' trembles and everyone is immediantly awake. Seadramon appears, a sea dragon type of Digimon. It turns out it's tail was the red material. And it's stuck onto the island. It starts to swim and it pulls along the island with it. Tentomon comments on how Seadramon is a bit dense, and that he doesn't know that he's pulling the group along. He accidently hops onto the red material. Now Seadramon notices. Seadramon frees his tail and swims underground. He pushes th island in hopes of it crashing. Matt and Gabumon sees all this happening. Matt wants to save TK and jumps into the water. Matt swims towards the island. Now the island has stopped and is in the middle of the lake. Gabumon contemplates about his fur being wet and then going to be smelly. He jumps in also and swims toward Matt. The Digimon all attack but Seadramon's too powerful and big. "Agumon digi-volve!" Tai commands. Agumon tried already and to no avail. He's still weak after the last battle with Shellmon.
TK sees Matt swimming towards him and runs towards him and falls into the water! Luckily Gomamon was nearby, he jumps in and hangs onto TK. Matt instructs Gomamon to bring TK to safety. Seadramon sees them. Matt distracts his attention and swims off. Gabumon arrives and attacks with his 'blue twister'. Seadramon flicks Gabumon off with his tail, "Ahhh! I hate this...." Gabumon says while flying in the air. Seadramon grabs Matt and wrap it's tail around him. Tentomon explains that when Seadramon finds his prey, it will not let go. Matt is slowly being crushed. TK pleads Patamon to save him, but Patamon's too small. Patamon sees Gabumon and says he's stronger than him. Gabumon agrees, "I don't understand any of this. But I got to save Matt! What's a little stinky fur compared to a friend?" Matt's digi-vice is activated. The screen zooms inside the digi-vice. A set of commands appear and scroll up the screen. Gabumon digi-volve to...Garurumon! Garurumon has the appearance of a white canine with blue stripes and sharp teeth. Garurumon jumps in crashes Seadramon's tail, knocking Matt out of it's grasp. Garurumon jumps onto the back of Seadramona and bites hard. Matt swims away. Tentomon gives some brief information about Garurumon. He says that Garurumon's fur is legendary. It's strong as steel. He's right now like a swimming torpedo. Garurumon swims towards Seadramon and bumps Seadramon. Seadramon is hit each time.
Seadramon uses his lethal ice blast on Garurumon. The ice blast freezes Garurumon. He breaks free and attacks with his "Growling Blaster!" It knocks out Seadramon, everyone cheers. Garurumon digi-volved back to Gabumon. TK is impressed by both his brother and his Digimon partner. Gabumon says to Matt, "Your the man." Matt says to Gabumon, "And your the wolf-man!" Everyone laughs. How will they go back? They're stuck in the middle of the lake. Gomamon jumps into the water and calls out "Fish Power!" All the fish in the lake appear and push the island back.
On the beach, Izzy notices a pattern. Tis time only Gabumon digi-volved. Tai thinks back when Agumon digi-volved to Greymon. They conclude that the digimon only digi-volve when their in danger. They all fall asleep. Tai hears the vivid tune of a lone harmonica. He walks over and sees TK with Matt, his head on his shoulders. Tai smiles and decides not to bother them, he stands behind the tree. "Aah (sigh)...big bro your the best," TK says sleepily and falls into a deep slumber. Matt just keeps on playing his harmonica. Matt understands now, how his brother means so much to him.