Claire Holt as Kiara Rivers/Cynder

Robert Downey Jr. as Tony Stark/Iron Man

Chris Evans as Steve Rogers/Captain America

Jeremy Renner as Clint Barton/Hawkeye

Mark Ruffalo as Bruce Banner/Hulk

Scarlett Johansson as Natasha Romanoff/Black Widow

guest starring

Zachary Quinto as Todd Brealey

Milo Ventimiglia as Seth Joyce

Kristen Stewart as Kasey Clark

with

Tom Hiddleston as Loki

Chris Hemsworth as Thor

Cobie Smulders as Maria Hill

Gwenyth Paltrow as Pepper Potts