Though we're still a long way off from Guardians of the Galaxy Vol. 3 even beginning production, as it'll have to wait until director James Gunn is finished with The Suicide Squad, one of its stars recently said some very exciting and encouraging things about the screenplay. Talking to THR, the MCU's Karen Gillan, who's played Nebula in the two Guardians movies and the last two Avengers films, shared about what she knows regarding Vol.