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The Ninja Cloak is in one of Glacier Valley's hidden chests.
Shadow of the Cloak - 1951 The Tattoo 1-3 was released on:
USA: 13 June 1951
To go into cloak mode as a Predator in Alien vs Predator for the PlayStation 3 you have to press TRIANGLE.
Cloak
Loonatics Unleashed - 2005 The Cloak of Black Velvet 1-3 was released on:
USA: 1 October 2005