I bet you thought I was going to use Jar Jar Binks for today, right? Sorry Jar Jar, but no.

Jabba the Hutt was a big fat blob and notorious crime lord.  Although he was mentioned we didn't get to see him in the original movies until the Return of the Jedi. He was eventually added via CGI to a New Hope.

In episode VI, Han Solo is on the run from Jabba after losing Jabba quite a bit of money when Han dumps Jabba's cargo that he was smuggling for him. Jabba sends bounty hunters to search for Han and bring him back to Tatooine so he can punish him.

Unfortunately for Jabba, after he finally gets Han back, Luke, Leia, and Chewbacca come to Han's rescue. Leia was captured and forced to be Jabba's slave, but she eventually chokes Jabba to death while wearing the famous gold bikini.