Mantis' appearance here later explained by Kurt Busiek in Avengers Forever as being the appearance of a Space Phantom brainwashed into believing he was Mantis.
Iron Man [Tony Stark]; Neut Master at Arms; James Rhodes; Masque; Marianne Rogers; The Avengers [Hawkeye; Vision; Quicksilver; Crystal; Wasp; Black Widow [Natasha Romanova]]; Edwin Jarvis; U.S. Agent
Synopsis
Stark gets the Avenger's safe opened and is attacked by Neut-Master at Arms.