After a failed assassination attempt by the not-as-nice-as-Chewbacca Wookiee Black Krrsantan, the Hutt twins arrive and fess up to Boba. They were the ones who ordered the attempted hit on him. "Please accept this gift as restitution." The male Jabba twin says. Cue Danny Trejo rolling up to Boba with a giant Rancor!

Danny is simply credited as the Rancor trainer. The monstrous beast certainly isn't on par with a cute puppy for comparison. However, the Rancor trainer teaches Boba that the Rancors aren't as dangerous as people make them out to be. The last time we saw a Rancor in Star Wars was when Luke Skywalker (Mark Hamill) killed Jabba the Hutt's Rancor in Return of the Jedi.