In two episodes of the 80s TV show Knight Rider, Peter Cullen voiced K.A.R.R., sort of an evil twin to the artificially intelligent Pontiac Trans Am, K.I.T.T. Cullen later reprised the role for the 2009 Knight Rider reboot.
Cast as the original voice of Autobot leader Optimus Prime in the 1984 animated Transformers series, Cullen reprised the role numerous times thereafter, including the recent trilogy of Michael Bay movies.
In order to compete with Hasbro's Transformers success, Tonka released their own morphing robot vehicle line of toys with promotional animated series known as Gobots. As though the entire concept wasn't similar enough, Peter Cullen was also cast to voice Spoiler, Tank, and Pincher.
There's no question in my mind that if Voltron could speak, he would sound exactly like Optimus Prime. But since Voltron is only a machine piloted by five distinct characters, Peter Cullen voiced the show's narrator in addition to the characters of King Alfor and Coran.
Voicing awesome mechanical men isn't all that Peter can do. He's also played Pooh Bear's perpetually depressed, probably suicidal friend Eeyore in 11 films and at least three Disney television series.
Cullen also played Monty, the Australian mouse with a serious lactose dependency problem on Chip 'n Dale: Rescue Rangers.
Although uncredited, Peter Cullen performed the Predator's vocal effects.
Cullen also portrayed Rainbow Bright villain Murky Dismal.
Bankjob Beagle of the Beagle Boys gang, Mad Dog McGirk, Admiral Grimitz, and more.
Cullen has also provided the voices of countless minor characters on Teenage Mutant Ninja Turltles, TaleSpin, the Gummi Bears, Dino-Riders, G.I. Joe, My Little Pony, The Chipmunks, Muppet Babies, Monchhichis, The Jetsons and scores of others. See his IMDB and Wikipedia pages for more!