Captain Ultra (Griffin Gogol) is a superhero appearing in American comic books published by Marvel Comics. Created by Roy Thomas, George Pérez, and Joe Sinnott, the character first appeared in Fantastic Four #177 (December 1976). Captain Ultra has been a member of the Revengers at various points in his history.

Roy Thomas asserted, "Captain Ultra was a parody character that George Perez and I made up for FF #177, in our own spoof of DC's auditions for the Legion of Super-Heroes (it had that quasi-legion of rejected heroes, remember?). We deliberately gave him what I've always called a "church-window" costume... one that has a zillion design pieces, and nearly as many colors, with nothing to really focus the eye. But of course, since he was a virtual Superman, we had to give him a "Kryptonite," so we made it fire, as a sort of homage to the Martian Manhunter. The joke was that the Frightful Four, if they had let him join, would have been going up against the Fantastic Four--with its Human Torch--aided by a man who passed out in the presence of any kind of flame."

Captain Ultra debuted in Fantastic Four #177 (December 1976), and was created by Roy Thomas, George Pérez, and Joe Sinnott.

Griffin Gogol was a plumber who underwent psychological treatment and hypnosis to cure his smoking habits. Unbeknownst to him, his psychologist is an alien, and the hypnosis unlocks his innate superhuman abilities. Donning a clashing, colorful costume, Gogol became the superhero Captain Ultra. However, it is revealed he suffers from severe pyrophobia (fear of fire) as a side-effect.

Captain Ultra subsequently applies to join the Frightful Four. They eagerly accept him, but later reject him after he faints in the presence of a match. He also works with the Defenders in New York, but never considers joining them.

Soon after, he moves to Chicago. He has since had a minor career as a solo superhero, often teaming up with heroes like Thor to battle minor villains.

Ultra later overcomes his pyrophobia after undergoing therapy with Doc Samson and becomes a comedian. His comedy career takes him across the country. Superheroics interfere with this, such as when the underground dirt creature Mud Pi kidnaps the citizens of Wash Basin, Texas. Captain Ultra manages to rescue them all.

Doorman begged him to join the Great Lakes Avengers, but Captain Ultra angrily rejects him.