Diablo

When The Fantastic Four stumble upon an old castle ruin in Transylvania, The Baron Hugo tells them the legend of Diablo; he was sealed in this crypt 100 years ago to this very day and was said to have discovered the secret of prolonged life. That night, The Thing is lured, in a trance, back to the ruins. He frees Diablo, who rewards him with a vial of potion which makes him almost human again. With his miracle potions and The Thing as his assistant, Diablo tries to conquer the world. When Diablo's potions prove to be only temporary, The Thing turns against him and seals him back in his crypt.

Reed Richards/Mr. Fantastic, Ben Grimm/The Thing, Johnny Storm/The Human Torch, Sue Storm-Richards/The Invisible Girl, The Watcher

Based on the popular Marvel comic book characters, The Fantastic Four were a group of scientists who were accidentally struck by cosmic rays during the launching of a test rocket ship. When their experimental ship passed through cosmic radiation too strong for its shields to withstand, the four—scientist and rocket designer Reed Richards, his wife Sue, ace pilot and lovable lunkhead Ben Grimm, and Sue's hotshot younger brother Johnny Storm—were all bombarded with cosmic rays. Crash landing on earth, the four discovered that the radiation had left each of them with a strange, new power.

Reed, soon to be called Mr. Fantastic, became a pliable mass, with limbs that could stretch to seemingly endless limits. Sue gained the power of invisibility, and was thus named the Invisible Girl. Ben became The Thing, an incredibly strong, orange granite behemoth who constantly grumbled about his new lumpy appearance. Johnny gained the ability to "Flame on," encasing his body in fire and giving him the power of flight. The impetuous youth's new powers earned him the nom de superhero The Human Torch.

Flying into action aboard the Richards-designed U-Car, the Fantastic Four battled such evil luminaries as the Mole Man, the alien Skrulls, and the despotic Doctor Doom. The Fantastic Four ran for two original seasons and one season of repeats before bowing out in 1970. Later in the decade, The New Fantastic Four hit the airwaves, with The Human Torch replaced by wisecracking robot H.E.R.B.I.E. The new show lasted only one season, but the original foursome returned with new episodes fifteen years later as part of Iron Man.