His "Doctor Claw" voice is arguably his most famous role. Aside from playing Doctor Claw on Inspector Gadget (1983), he has used the voice for other characters, such as Darkseid on SuperFriends: The Legendary Super Powers Show (1984), Emperor Krulos on Dino-Riders (1988), Soundwave on The Transformers (1984) (only heavily modified with a vocoder, to give it a distinct monotone, robotic sound), as well as in movies such as the Cave of Wonders in Aladdin (1992), Shao Kahn in Mortal Kombat (1995), Soundwave again in both Transformers: Revenge of the Fallen (2009) and Transformers: Dark of the Moon (2011) (without the vocoder effects), as well as playing the Devil in four movies: The Golden Child (1986), All Dogs Go to Heaven (1989), Bill & Ted's Bogus Journey (1991) and Spawn (1997).