"We go around antagonizing everybody, and making life difficult for the Guardians," she said in an interview backstage after her FanX appearance. "And Nebula's cool because she has a cybernetic eye and arm."
When Gillan's agent approached her about the role, she said, "the first question was, 'Are you willing to shave your head?… It's for a Marvel film.' I honestly thought there's no way I'm going to get it."
Shaving her trademark ginger tresses was a big change, and "for the transformational aspect of it, it was just what I want as an actor," Gillan said. "It was perfect for me, because it made me feel like a different person. It made me feel intimidating for the first time in my life."
Part of playing Nebula involved training for a spectacular fight scene with one of the Guardians, Gamora (played by Zoe Saldana).
Gillan's advice for the FanX crowd: "First of all, never fight with Zoe Saldana." Backstage, she added, "It took me two months to learn a sequence that took her two days. … The time and effort that goes into a Marvel [action sequence] is insane."
Being in "Guardians of the Galaxy" also means Gillan — who made her American film debut this April with the horror movie "Oculus" — is now part of the ever-expanding Marvel universe.
"They sent me this letter saying, 'Welcome to the Marvel family,' and I'm having it framed. It means that much to me," she said. "It's the coolest thing ever."