Reptil joins the Super Hero Squad and Wolverine is assigned to be his mentor. He immediately gets to prove his worth as the Squad races to stop Doom and the Wrecking Crew obtaining a hidden fractal.

The squad gets frustrated when Silver Surfer cannot get the hang of Earth customs.

Hulk picks up a fractal and turns into the gray hulk. In this incarnation he is super smart, but also looks down on his teammates and fighting bad guys.

A bratty 3-year old wears a fractal tiara gaining a terrifying power over reality itself.

Loki borrows some of Doom's henchmen to start a war in Asgard, leaving the Lethal Legion headquarters less well defended. This prompts Iron Man to try and get at the villains' fractal stash.

Falcon is doubting his own usefulness on the Squad. When a miniaturized Egghead steals an Infinity Fractal on the Helicarrier, Ant-Man shrinks most of the Squaddies down to the villains size.

Thanos approaches Doom with an unholy alliance and asks the Lethal Legion to steal an artifact from the Baxter Building. Meanwhile The Super Squad teams up with the Fantastic Four to fight off a Skrull invasion.

Shield agent Black Widow helps the Super Hero Squad out in a fight and is invited to stay aboard the Helicarrier. Little do the Squaddies realize she is actually Mystique in disguise and reporting to Doctor Doom.

When an Infinity Fractal is attached to M.O.D.O.K.'s head, he gains the power to drain those of others. Soon, the Mighty M.O.D.O.K. rules Villainville with Loki as his new BFF (Best Fiend Forever).

Enchantres plans to make Thor fall in love with her by using an Asgardian Love Lutefisk. But Ms. Marvel ends up loving M.O.D.O.K. instead. Thor is only interested in Valkyrie anyway.

When Baron Mordo possesses Iron Man turning him into the Iron Menace, Hulk and Silver Surfer must team up with Doctor Strange and Valkyrie to form a team of Defenders and stop Baron Mordo's evil plot.

War Machine teams up with Iron Man when Doctor Doom, Crimson Dynamo, and Melter band together in a plot to eliminate Iron Man. Meanwhile, Wolverine and Reptil face off against Abomination and M.O.D.O.K. in a game of golf.

When a smilodon appears in Super Hero City, a mysterious jungle lord named Ka-Zar shows up. Meanwhile, the Lethal Legion have plans for the smilodon.

Magneto is working with Doom to rob all the Infinity Fractals from the Vault. His sinister plan involves letting his children, Quicksilver and the Scarlet Witch befriend the SHS to get the entry codes.

To show his minions what real villainy looks like, Doom thaws out the infamous WWII menace, the Red Skull.

Stardust arrives on Earth to announce the coming of Galactus, devourer of worlds. Captain America and Ms. Marvel begin constructing a space ark to save the inhabitants of Earth while the SHS team up with the Fantastic Four to face Galactus.

Galactus is about to devour Earth and not even the combined power of all the Super Heroes (and even some villains) can stop him. Iron Man decides to gather all the Infinity Fractals and reforge the Infinity Sword.