Mighty Man is a fictional, costumed crimefighter. He starred in the Mighty Man & Yukk segment on The Plastic Man Comedy/Adventure Show, which itself aired from September 1979 to September 1980.
Mighty Man is notable for a superhero in that he himself is only a few inches tall, whereas his alter ego — millionaire Brandon Brewster — is approximately six feet tall. Brewster "changes" from his playboy persona into Mighty Man via the Mighty Machine, a beam-shooting pistol which simultaneously gives him his superpowers and miniaturizes him. Just after the transformation, he shouts in slow bursts, "Mighty, Mighty, Mighty Man!"
Both Mighty Man's and Brandon Brewster's characters are voiced by Peter Cullen, years before he won the role as the voice of Optimus Prime in The Transformers cartoon series --alongside his colleague Frank Welker, who was the voice of Optimus Prime's enemy, Megatron, and who in this cartoon series provided the voice of Yukk!, Mighty Man's faithful sidekick. Mighty Man's name, size and powers were clearly based on that of Mighty Mouse.
Yukk! has no alternate persona and freely associates with Mighty Man in both his superhero form and his normal form; seemingly an obvious tip off to anyone who wanted to uncover Mighty Man's secret identity.
Mighty Man possesses many of the "standard," stereotypical powers of a Superman-type superhero: he can move at high rates of speed, fly, (although he is just as often seen transporting himself and his sidekick around in a tricycle), is highly resistant to physical damage, and has super-strength - in Mighty Man's case, roughly as much strength as is seen in super-powered beings many times his size.
Interestingly enough, despite his formidable array of powers, it often fell to his sidekick, an unbelievably ugly anthropomorhic hound named Yukk! (he's so ugly that things get wrecked and the area shakes violently as if in an earthquake--hence the doghouse on his head to hide his face), to free him from the death-traps which he often ended up in and/or save the day.