In the episode Beyond, he recreates Avengers Tower for the Avengers and New Avengers and he tells the two groups about Battleworld as part of his experiment.

In the episode Underworld, its revealed that Beyonder manipulated Loki.

Beyonder also demonstrates his abilities by splitting the Hulk and Bruce Banner apart before sending the two to the other parts of Battleworld.

In the episode The Citadel, Beyonder has Ares, Absorbing Man, Crimson Widow and MODOK bring him both Iron Man and Captain America.

While his enforcers fight Captain America, Beyonder tries to convince Iron Man to be a part of his experiment.

In actuality, Beyonder manipulates Iron Man and Captain America to fight each other.

Wanting to see who will win, he gets blindsided when the two Avengers were acting and get away with his own information.

In the episode The Wastelands, Beyonder goes after the Avengers two groups due to wanting to undo Battleworld.

He first sends Ares and an army of Ghost Riders, and then personally goes after the two groups, leading to Jane Foster using Mjolnir to defeat him.

Avengers Assemble Secret Wars