Two of Rambeau's enemies are super-powered psychiatrist Moonstone (Karla Sofen), and Moonstone's powerful pawn Blackout (Marcus Daniels), who wields the Darkforce. Captain Marvel first encountered them when the Avengers opposed the duo's escape from incarceration in Project: PEGASUS. After that, Rambeau temporarily lost her ability to transform back to human form during a battle against Dr. Eric Paulson, in which she fought alongside Spider-Man and Starfox. She was with the team when the Beyonder abducted them and other Earth superheroes for the first Secret Wars saga.