IG-88 had a few seconds of screen time in The Empire Strikes Back as one of the gruesome bounty hunters that Darth Vader hired to trap Luke Skywalker.
According to Wookieepedia, the IG-88 line of droids were programmed to be assassins. The scientists who created, programmed, and/or activated the droids for the first time underestimated the degree of sentience and the independent nature of their AI; the IG-88s' first action was to murder their creators. It reminds me of Frankenstein or the baby in It's Alive!
I'm disappointed that I'm not able to simulate the big clunky feet shown in the Kenner action figure in my sculpture. Whenever I try anything like that, the piece usually collapses before it dries or disintegrates in the bisque kiln.