Powerless

The Enchantress, as part of her master Surtur's plan, offers Loki a chance to exact his revenge on Thor and the Avengers for thwarting his conquest of the Nine Realms, and uses a spell to strip Thor, Captain America, and Iron Man of their powers. Now, the helpless heroes must defeat Loki - his soul now in command of a powerful Asgardian weapon known as the Destroyer - without their abilities.
NOTE: This episode was skipped in US airings, but included on the Avengers: Earth's Mightiest Heroes boxed volume Secret Invasion as a bonus episode. Marvel released a clip of the episode, adding that it is "an un-aired episode available exclusively" on the DVD. This episode is part of the regular airing schedule on ABC Australia, and eventually broadcast on Disney XD in the US on May 5, 2013.