Answer by taking a quote from the following article:

Mojo is a fictional character, a supervillain appearing in American comic books published by Marvel Comics, usually those featuring the X-Men family of characters. Created by writer Ann Nocenti and artist Arthur Adams, Mojo first appeared in Longshot #4 (December 1985), as the titular hero's archenemy, and subsequently a villain to the X-Men and their various sub-groups as well. Mojo is one of the "Spineless Ones," an alien race that is immobile without advanced technology.

Mojo appeared in the X-Men episodes "Mojovision" and "Longshot" voiced by Peter Wildman. This version of Mojo had the ability of shooting laser blasts from a cannon installed at the tip of his mechanical tail.  Mojo first appears in the Wolverine and the X-Men episode "X-Calibre" voiced by Charlie Adler. He sends Spiral and the Reavers to ships bound to Genosha to pick out the mutants for his program. After Spiral was thwarted by Nightcrawler and sees the X-Men, Mojo plans to abduct them. In "Hunting Grounds," Mojo abducts Nightcrawler and Scarlet Witch and forces them to fight a mind-controlled Wolverine. Eventually all three X-Men escape the show and attack Mojo himself, but he and Spiral teleport to safety. Mojo declares that "This demands a sequel!", indicating that they will be back.  Mojo appears in Avengers Assemble episode "Mojo World," voiced by Ralph Garman. Mojo's "Mojo Adams" incarnation used as a simulation to conceal his actual appearance from his viewing audience. Intending to capture Hulk for his tournaments, alongside the other combatants he abducted and threatened to fight by taking their planets hostage, Mojo finds his minions unintentionally abduct Hawkeye in the process as he pit the Earth hero against Torgo. After Hulk and Hawkeye forfeit an all-out fight, Mojo teleports them back to Earth and then plans to destroy it. With help from the other Avengers, Hulk and Hawkeye managed to defeat Mojo, and his hover-cameras end up showing his true appearance across the airwaves. Embarrassed, he ends up teleporting away from his ship. Torgo tells the Avengers that he will take the prisoners back to their worlds and have a bounty placed on Mojo's head.

What was Mojo seen on?
Mojo appeared in the X-Men episodes "Mojovision" and "Longshot"