Having nailed the blue-skinned act in Avatar, Zoe Saldana is negotiating to join Guardians of the Galaxy as the green-skinned Gamora. In Marvel lore, Gamora was the adoptive daughter of Thanos, the big baddie who popped up in the end credits of The Avengers. Saldana would join Chris Pratt and WWE behemoth Dave Bautista in the film from Slither and Super director James Gunn.