The Dianoga resembles his film counterpart, though unlike in the films, his whole body is seen: it has a red eye and 7 tentacles. It is also shown to be somewhat loyal to Darthenshmirtz, always picking up any trash that is touched by Darth Vader for him.
The Dianoga is seen inside the Death Star's trash compactor, where Darthenshmirtz arrives to look for more objects that were personally touched by Darth Vader in order to power up his Sith-inator. Much to Darthenshmirtz's delight, the Dianoga manages to get an inhaler and a hoagie that carried enough midi-chlorians, but when the Dianoga shows a restrained Luke, Darthenshmirtz tells it to let him go, saying that he's not trash, he's a guy. It is presumed to have perished following the Death Star's explosion.