- Hulk don't do math. Hulk SMASH!
- -- Hulk
Appearing in "To Err Is Superhuman!"
- Super Hero Squad
- Lethal Legion
- Doctor Doom (Victor von Doom)
- Abomination (Emil Blonsky)
- M.O.D.O.K. (George Tarleton) (First appearance)
- Wrecking Crew (First appearance)
- Mr. Sinister (Nathaniel Essex) (Mentioned)
- Balder the Brave (Mentioned)
- Lockjaw (First appearance; statue)
Races and Species:
- Irradiated Fossil (First appearance)
- Captain America's Shield
- Captain America's Uniform
- Infinity Sword (Fragmented)
- Iron Man Armor
- Silver Surfer's Surfboard
- Hawkeye's Bow
- Trick Arrows
- Doomsday Chair
- Doctor Doom's Armor
- Wrecker's Crowbar
- Thunderball's Ball and Chain
- Falcon's Wings
Synopsis for "To Err Is Superhuman!"
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.
- Hulk can be seen shouting "RIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIING!" after he completely destroys the phone in the end of the episode.