Appears in: Star Wars: Episode VI - Return of the Jedi (1983)
Scariest moment: Pinned against a closed gate and thinking that his time is up, Luke Skywalker (Mark Hamill) watches in panicked horror as the Rancor barrels toward him.
Weakness: George Lucas' inability to stop tinkering with his movies (like every other Star Wars character).
Of all the many otherworldly creations in George Lucas' Star Wars franchise, the Rancor, seen in 1983's Return of the Jedi, is by far the scariest. Well, unless you count Jar Jar Binks—that idiotic and totally racist character is horrifying for different reasons.
In terms of sheer terror, the Rancor has no Star Wars peer, and when Luke Skywalker (Mark Hamill) gets thrown into the beast's pit for Jabba the Hut's barbaric entertainment purposes, Return of the Jedi briefly becomes an old-school creature feature. Though the Rancor is too easily defeated, it's nonetheless a monster with real staying power.