Real Name: Unrevealed
Cloak was a member of the Sinister Six and presumably brainwashed by Sinister. When the Six fought the X-Men, Cloak sucked Gambit, Nightcrawler and Dazzler into his Darkforce dimension. When fellow Sinister Six member Dagger was injured, Cloak ran to her assistance, allowing Storm to attack him. Nightcrawler and Dazzler were freed from Cloak’s dimension but Gambit did not appear and was presumed dead. Assuming Cloak survived, it is likely that the X-Men had Psylocke remove his brainwashing.
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