1969

The X-Men:

Cyclops/Scott Summers

Iceman/Bobby Drake

Beast/Hank McCoy

Angel/Warren Worthington III

Marvel Girl/Jean Grey

Allies:

Polaris

Havok [ability to absorb energy, energy blasts]

Ka-Zar

Foes:

Blastaar [superhuman strength, durability and endurance, energy blasts] ⃰

El Conquistador [electrical genius, weapon master]

The Living Pharaoh/ The Living Monolith [energy absorption and projection, superhuman strength, durability and longevity, size and mass manipulation, telepathy, after absorbing enough energy he turns into a more powerful self named The Living Monolith, which can also emit cosmic energy blasts of concussive force from his eyes]

Larry Trask [genius level intellect and precognitive knowledge of future events]

Sentinels (now they can adapt to mutant powers, using their weaknesses against them)

Sauron [flight, superhuman strength and stamina, hypnotic eyes, ability to absorb energy and mutant powers, fire breath, can sense mutants, all granted after being bite by a Pteranodon and absorbing energy from mutants which also turns him into a Pteranodon]

Magneto

"Neo-Mutants": Lorelei [hypnosis], Brainchild [superhuman intelligence], Amphibius [humanoid frog-like mutant], Barbarus [four arms], Lupo [superhuman strength, speed, reflexes and durability, keen senses, sharp claws and fangs, control over canine creatures], Gaza [radar senses] and Piper [control over beasts, uses a flute to focus his power]

Synopsis:

Scott Summers’s younger brother; Alex Summers, is kidnapped by The Living Pharaoh, who plans to use Alex’s mutant powers of energy absorption and projection to increase his. Larry Trask, Bolivar Trask’s son, blames the X-Men for his father’s death, and used Bolivar’s notes to create a stronger wave of Sentinels aided by Federal Judge Robert Chalmers who was a friend of Bolivar and knew Larry’s secret (not only about his mutant powers, but also about the medallion his father gave him when he was a kid to block his visions of the future, as well as erase any memory of them), reviving the fear of mutants in humans through the media and establishing a new witch hunt. Alex, now named Havok, after being captured by Sentinels like many other mutants, makes a deal with Trask to confront the X-Men in exchange of a suit to control his power, but he never really intended to follow his lead. Robert Chalmers changes his mind about Larry’s ideal; feeling he was crossing the line, putting mutants under critical circumstances, so he removes Larry’s medallion and the Sentinels capture him since they start to detect his mutant powers. Sentinels were eventually outwitted by Cyclops, and flew into space to meet their destruction in the sun. The captive mutants are freed and Judge Chalmers puts back the medallion on Larry to erase the knowledge of what happened to him. An unconscious Havok is treated by Dr. Karl Lykos, who was secretly absorbing energy from humans, ability acquired after being bite by a pteranodon in a past trip to a cave zone near the Savage Land. After absorbing energy from Havok, he gained an amount never acquired before from any human, transforming himself into a Pteranodon-like humanoid that calls himself Sauron, changing back to his human form when low in energy. After fighting and losing to the X-Men, he falls into an abyss, directly into the Savage Land. Magneto, who's now in the Savage Land, leads a small group of outcast savages with mutant powers created with a machine that induces mutation on humans, to take over the Savage Land and then the rest of the world; he calls them “Neo Mutants”**. After destroying the machine, the savages go back to their normal self.  

* A known villain of the Fantastic 4, member of an alien race called Baluurians that lives in the Negative Zone.

** In the first X-Men movie, Magneto also creates a machine that drains his magentism powers out of him, making him weak for a while, to transform humans into mutants.