The Super Hero Squad fights to keep a fractal away from Doctor Doom when he sends Mole Man, Mole Man's monsters, and Fin Fang Foom to attack Super Hero City.

Hulk's Transformation: Baby Hulk

First Appearance: Iron Man, Ms. Marvel, Mayor of Superhero City, Captain America, Wolverine, Hulk, Falcon, Redwing, Silver Surfer, Thor, Doctor Doom, Mole Man, Storm, Fin Fang Foom, Megataur, Tricephalous, Fantastic Four (Mister Fantastic, Invisible Woman, Human Torch, Thing), Abomination, Colossus, Shadowcat, Moloids, Luke Cage

Referenced: Beast, Cyclops

Wolverine is assigned to train Reptil (a hero trainee with an amulet that can turn any part of his body into that of any dinosaur) at the time when Doctor Doom sends Abomination and the Wrecking Crew to get the latest fractal.

Hulk's Transformation: Joe Fixit

First Appearance: Reptil, Hawkeye, MODOK, Wrecking Crew (Wrecker, Thunderball, Piledriver, Bulldozer)

The squad gets frustrated when Silver Surfer cannot get the hang of Earth customs. Doctor Doom sends Abomination and MODOK to capture the Silver Surfer in order to siphon his cosmic power. The Super Hero Squad and the Thing set out to save him.

Hulk's Transformation: Gray Hulk

During a chaotic battle with Klaw & Screaming Mimi, a fractal’s cosmic power turns the Hulk into the Gray Hulk. His new form makes him a super smart guy who doesn't like to fight, and thinks that the Super Hero Squad are childish. To redeem themselves, Klaw and Screaming Mimi rendezvous with Melter and Toad to find a fractal at the local reservoir.

Hulk's Transformation: MODOH (Mental Organism Designed Only for Hulking)

First Appearance: Wasp, Klaw, Screaming Mimi, Toad, Melter

Referenced: Amadeus Cho

Supernatural wackiness is turning Super Hero City upside down during the Super Hero Squad's fight with Sabretooth and Juggernaut. The Super Hero Squad seek the help of Doctor Strange (who is not acting like himself lately). Doctor Strange opens a portal to the Dark Dimension enabling Dormammu to enter and seek the fractals stored at the Vault and in Villainville.

Hulk's Transformation: Hulk-Bot (somehow similar to Transformers' Optimus Prime)

First Appearance: Doctor Strange, Dormammu, Mindless Ones, Sabretooth, Wong, Juggernaut

A bratty 3-year-old named Brynnie Bratton wears a fractal tiara, gaining a terrifying power over reality itself. Meanwhile, Falcon helps Heroes For Hire find her father.

Hulk's Transformation: Wolverine-Hulk

First Appearance: Heroes For Hire (Iron Fist, Luke Cage, Misty Knight), Pyro, Whirlwind, Zzzax, Brynnie Bratton

Loki wants to take control of Asgard, but Odin refuses to let him have the responsibility so he asks for Doctor Doom's aid. Thor finds a fractal that makes him forget who he is and it's up to Hulk and Iron Man to try to revive his memories.

First Appearance: Heimdall, Loki, Odin, Sif

When Scorpio tries to steal top secret Stark Tech, the Super Hero Squad team try to figure out Scorpio's plot. What neither they nor Doctor Doom, MODOK, Abomination, and even Mole Man know yet is that Scorpio is acually Nick Fury in disguise.

Hulk's Transformation: Vision

First Appearance: Nick Fury

Enchantress uses her magic to crash the Helicarrier into the Great Wall near Villainville and Ms. Marvel blames Falcon. After attempts to bunk in at Stark Industries, Punisher's van, and Reptil's house, the Super Hero Squad try to bunk at the Sanctum Sanctorum where Doctor Strange warns them that there is a magic threat responsible for their misfortunes.

Hulk's Transformation: Saturday Night Fever Hulk

First Appearances: Baron Mordo, Enchantress, Punisher

Referenced: Brother Voodoo, Inhumans, She-Hulk, Texas Twister

When MODOK and Abomination botched up another fractal retrieval mission, Doctor Doom pairs them up with Egghead to infiltrate the Helicarrier in micro-size. When Ant-Man is called in to help, it is a micro-sized, all-out battle for the fractal.

Hulk Transformation: Simpson Hulk.

First Appearances: Ant-Man, Egghead

Referenced: Mad Thinker, Quicksilver

When he is tired of all he can take with the Super Hero Squad, Wolverine joins up with the internation All-Captains Squad (consisting of Captain America, Captain Australia, Captain Brazil, Captain Britain, and Captain Liechtenstein) as Captain Canada where he helps them fight Plantman in the Amazon. Meanwhile, the rest of the Super Hero Squad have an embarrassing encounter at Ringmaster's circus when Doctor Doom sent Abomination and MODOK to recruit Ringmaster.

Hulk Transformation: Baby Hulk

First Appearances: Captain Australia, Captain Brazil, Captain Britain, Captain Liechtenstein, Plantman, Ringmaster

Referenced: Red Skull

With some of the members on vacation, Iron Man and Hulk help out the Fantastic Four when Super-Skrull and his fellow Skrulls invade Super Hero City. Meanwhile, Thanos and Doctor Doom form an alliance in order to obtain a specific artifact from the Baxter Building. While the Fantastic Four and the other Super Hero Squad members are fighting the Skrulls, Falcon and H.E.R.B.I.E. defend the Baxter Building from Abomination, MODOK, and Trapster.

Hulk's Transformation: Gray Hulk

First Appearances: H.E.R.B.I.E., The Skrulls, Super-Skrull, Trapster, Thanos (Acutally a Skrull Con Man in disguise)

Black Widow joins the Super Hero Squad and shows that she can hold her ground against Abomination, MODOK, and Screaming Mimi. Unbeknownst to them, she is really Mystique in disguise sent by Doctor Doom to steal the Infinity Fractals. When Mystique (alongside Abomination, Klaw, MODOK, and Toad) nearly gets the Infinity Fractals held at the Vault, the Super Hero Squad get an unlikely assistance from S.H.I.E.L.D. Agent Songbird (who had been undercover as Screaming Mimi all along).

Hulk's Transformation: MODOH (Mental Organism designed only for Hulking)

First Appearances: Mystique, Songbird, Black Widow

MODOK and Loki conspire to overthrow Doctor Doom and take his place as leader of his allied villain group after MODOK eats one of the fractals. In order to stop MODOK and Loki, the Super Hero Squad and Storm must team up with Black Panther and an unlikely ally...Doctor Doom.

Hulk's Transformation: Joe Fixit

First Appearances: Black Panther, Impossible Man, Leader, Tana Nile, Uatu

Enchantress uses an Asgardian Love Lutefisk in order to make Thor fall in love with her. Instead it backfires causing Ms. Marvel to fall in love with MODOK. This causes S.H.I.E.L.D. to have Hawkeye take out Ms. Marvel before MODOK brings her to Doctor Doom's side. At the same time, Executioner plans to defeat Thor in order to get Enchantress to love him. Also, Thor develops a crush on Valkyrie.

Hulk's Transformation: Hulk Bot

First Appearances: Executioner, Valkyrie, Warriors Three (Fandral, Hogun, Volstagg)

Referenced: Frigga

When Baron Mordo possesses Iron Man turning him into the Iron Menace and escapes from the Dark Dimension, he plans to take over Super Hero City and Villainville. When Wolverine, Falcon, and Redwing end up under Baron Mordo/Iron Man's control, Hulk, Silver Surfer, and Thor must team up with Doctor Strange and Valkyrie to form a team of Defenders and stop Baron Mordo's evil plot. Doctor Doom and MODOK reluctantly help them when Iron Menace takes control of Abomination.

Hulk's Transformation: Wolverine-Hulk

Referenced: The Wizard of Oz

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 MODOK in a game of golf.

Hulk's Transformation: Bruce Banner

First Appearances: Crimson Dynamo, War Machine

Referenced: Devil Dinosaur & Moon-Boy, Forbush Man, Magneto, Mandarin, Squirrel Girl, She-Hulk, Titanium Man

When a smilodon appears in Super Hero City, a mysterious jungle lord named Ka-Zar shows up stating that the smilodon is actually his companion Zabu. When the Super Hero Squad encounter Ka-Zar, they learn of his mission and help him rescue Zabu. Meanwhile, Doctor Doom sees the Star Quartz (which will bind and merge any metal in the presence of Vibranium) around Zabu's neck and sends Toad, Thunderball, Sabretooth, and Batroc the Leaper to steal Zabu in a plot to reforge the Infinity Sword.

Captain America sends Wolverine back to Xavier Academy to get his diploma and finish his remaining credits. Reptil tags along to see what Xavier Academy is like and meet the X-Men. To make matters worse, Ringmaster shows up and hypnotizes the entire X-Men team in order to find an Infinity Fractal for Doctor Doom.

Hulk's Transformation: Saturday Night Fever Hulk

First Appearance: Cyclops, Iceman, Jean Grey, Lockheed, Professor X

Magneto is in town and he tricks his children Quicksilver and Scarlet Witch into helping in a sinister plot to steal the Infinity Fractals at the Vault for Doctor Doom.

Doctor Doom sends his "Team Toxic" to melt the polar ice caps. While Flatman and Reptil lecture about the polar ice caps, the world starts flooding. Iron Man must now convince Iceman to help save the day.

In order to show his minions what real villainy is like, Doctor Doom thaws out the WWII villain Red Skull. Captain America isn't pleased to find his old enemy up to his old tricks while Doctor Doom isn't thrilled about Red Skull's enormous ego.