THE BOUNTY HUNTERS IN THE EMPIRE STRIKES BACK WERE SAID TO BE THE MOST RUTHLESS IN THE UNIVERSE. HERE ARE THE STORIES OF THOSE SIX HUNTERS

From right to left they are: Dengar, IG-88, Boba Fett, Bossk, 4-LOM, and Zuckuss Click on a hunter to see their story

Dengar

He is a cybernetically enhanced Imperial assassin, surgically stripped of all excess emotion, Dengar vies for the glory of meeting Darth Vader's challenge - and of bringing down his longtime enemy, Han Solo.  He flies a Corellian Jumpmaster 5000 called Punishing One, and likes his blaster rifle, concussion grenades, and a viroblade to fight his battles.  When he was searching for Jabba the Hutt's body after his sail barge was destroyed he found Boba Fett instead and nursed him back to health.  Dengar and Fett work together for awhile but Fett was somewhat glad to be rid of him after Dengar had other interests in the bounty hunting business and figured he no longer needed Fett. 

IG-88A

One of four renegade IG series assassin droids, a sentient killing machine created at Holowan Laboratories that killed his creators as his first target, embarks on Vader's quest to find Han Solo and bring him back to the Imperials alive - but even the Dark Lord himself is but a small wrinkle in IG-88's plan to claim the galaxy as his own domain.  He flies his ship the IG-2000, and uses his blaster rifle to fight.  He was destroyed by Boba Fett after he followed him to Tatooine trying to steal the carbonite frozen body of Han Solo, so he himself could claim the reward from Jabba the Hutt.  

Boba Fett

Go See A More Complete Story Of This Great Bounty Hunter, Plus, Pictures, Sounds, And More

Boba Fett is the most feared bounty hunter in the galaxy.  He was the bounty hunter that caught Han Solo for Jabba The Hutt and led Darth Vader to Luke Skywalker.  He wears the armor of a Mandalorian Super Commando, specially modified to his liking, and flies his Kuat System's Engineering limited-production, high-speed Firespray-class ship the Slave I or MandalMotors Pursuer enforcement ship the Slave II.  After he brought Han to Jabba he fell into Great Pit of Carkoon and was devowered by the all mighty Sarlacc . . . or was he?  No, actually he climbed out three days later and found by Dengar.  Fett's armor was destroyed and wore a backup pair he had kept.  During a later encounter with Han and Chewbacca,  the angry Wookie ripped off Fett's helmet and now uses it as a hood ornament on the Falcon.  After that no one really knows what happened to Boba Fett or Jaster Mereel as he was originally named but then changed it for some unknown reasons.  Maybe we'll find out someday.

Bossk

A lizard like Trandoshan hunter who slaughters Wookiees for their pelts, and is now looking to make Chewbacca the latest addition to his collection.  That is the reason he is in Vader's quest for Han Solo.  He flies a YV-666 modified light freighter Hound's Tooth.

4-LOM andZuckuss

Zuckuss is a Gand intuitive, with the power to out guess his enemies.  He wears Mandalorian Super Commando armor, similar to Boba Fett's, modified with a life support system for his fatal disease.  His logic-driven droid partner, 4-LOM, find their own meaning in Vader's quest for Han Solo: Zuckuss, to gain funds for lifesaving surgery; 4-LOM, hoping to plumb the secrets of intuition.  Sharing a ship called the Mist Hunter Zuckuss and 4-LOM work for Jabba the Hutt around the galaxy.  For their combined knowledge makes them the deadliest pair of hunters around.

If you read all of these you probably figured out that Han Solo has more problems than you thought.