The Avengers: Earth's Mightiest Heroes

Loki's punishment at the end of the episode mirrors his punishment prior to Ragnarok in Norse mythology.

Goof: In the scene right after Loki's power is drained, Captain America can briefly be seen with his shield, despite having it smashed by Loki during the battle. Then, when he returns to the Avengers' mansion, his shield is once again in pieces.

Thor's hammer, Mjölnir, is made of a metal called Uru.

When Iron Man splits up the team, he sends each avenger to a different ley line. Ley lines are veins of magic that run through our world connecting it to others.

The nine realms of Asgard, connected by Yggdrasil (the tree of life) are: Asgard, Alfheim, Svartalfheim, Vanaheim, Jotunheim, Midgard, Nidavellir, and Niflheim.

When Ultron hits Thor with his beam that appears to disintegrate him, it is similar to an event that happened during the Secret Wars in Marvel Comics continuity. Dr. Doom controlled Ultron during that war, and ordered him to disintegrate Thor, who actually used his hammer's power to teleport across the planet when Ultron's beam hit him. All that was left of Thor at the scene were cape fragments and his helmet, loaning to the appearance of his disintegration.

Ben Grimm (a.k.a. the Thing) and Johnny Storm (a.k.a. the Human Torch) of the Fantastic Four make brief cameo appearances as they help the Avengers fight the ice creatures. The Human Torch is seen saving Captain America and writing "you owe me one" in the sky with his flame trail. The Thing is heard shouting "It's Clobberin' Time!"

Fantastic Four member Reed Richards (a.k.a. Mr. Fantastic), who has the ability to stretch and bend his body, makes a cameo appearance towards the end of the episode.

The Black Knight (Dane Whitman) makes a brief appearance fighting Kang's ships over London.

Quinjets cost approximately $20,000,000.

As of this episode, Iron Man only has three different sets of armor available.

The suit Simon Williams wears during the procedure resembles his original Wonder Man costume from the comics.

The Quinjets can reach air speeds as high as Mach 8.

The Avengers' mansion has a beyond state-of-the-art science lab. 

One of the soldiers with Captain America is named "Howlett", and addresses his commanding officer as "bub". This may be James Howlett, later Logan (also known as Wolverine, of the X-Men).

The S.H.I.E.L.D. agent piloting Hawkeye and Black Widow's jet is called Morse - most likely referring to Bobbi Morse, who became the heroine Mockingbird (to make an appearance later in the series, in the episode Widow's Sting) and married Hawkeye in the comics.

When Thor was battling Graviton, Graviton increased the amount of gravity on Thor by 1,000 times Earth's normal gravity - sending him to the bottom of the ocean. Later in the episode, the entire team was battling Graviton when he increased the amount of gravity on all of the heroes. When he did this, the only team member who could move at all was the Hulk (with great effort). We can assume that this means the Hulk is capable of withstanding 1,000 times Earth's normal gravity if not more when he tries hard enough.

This episode was combined with the microepisodes "Enter the Whirlwind", "Welcome to Wakanda", and "The Big House" to form "The Man in the Ant Hill", the fifth full-length episode of the series to be produced.

This episode made its online debut at disneyxd.com on Wednesday, 10/6/10.

This episode made its online debut at disneyxd.com on Friday, 9/24/10.