Season 1

Stan Lee

Mayor (voice)

Michelle Trachtenberg

Valkyrie (voice)

Shawn Ashmore

Iceman (voice)

Tricia Helfer

Sif (voice)

Tara Strong

Invisible Woman (voice)

Tom Kenny

Iron Man / Captain America / MODOK (voice)

Charlie Adler

Dr. Doom (voice)

Alimi Ballard

Falcon / Thunderball (voice)

Grey DeLisle

Ms. Marvel (voice)

Travis Willingham

Hulk (voice)

Jim Cummings

Thanos / Super Skrull / Human Torch (voice)

David Boat

Thor (voice)

Mark Hamill

Chthon (voice)

James Marsters

Mister Fantastic (voice)

Mikey Kelley

Silver Surfer / Iron Fist (voice)

Cree Summer

Storm (voice)