One of the most memorable scenes in "Avengers: Endgame" was improvised, according to star Karen Gillan.

In an interview with The Hollywood Reporter (THR), the actress, who plays Nebula in the multi-billion dollar franchise, revealed that the scene in which she plays desktop football with Tony Stark was not in the script.

"Now that you can talk about 'Avengers: Endgame,' who was actually better at flicking paper footballs: you or Robert Downey Jr.," THR asked the actress.

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"Well, I think it was me because that scene was improvised," she said. "And I won."

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She also dished on playing two versions of the same character, saying it was especially difficult because she was never given a full script.

"The way we differentiated them was by calling them 'good Nebula' and 'bad Nebula.' I had a lot of time travel questions coming from a time travel background," explained the 32-year-old actress. "The directors really kept me on track. So, they were all over that, and I just found out whatever I needed to know for each scene. When I finally watched it, I was like, 'Oh, this makes a lot of sense.'"

Another difficult part of the role? Her facial prosthetics.

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"I do think that they have an effect on me," Gillan said of the purple and blue prosthetics she wears in the film. "They really do get me into character. I don’t know if they always did or whether I just started to associate the mask going on and then I’m Nebula. They do sort of make me a bit less excitable, which I am naturally as a person. I can’t really move my face, and I feel a bit restrictive."

Gillan also discussed her upcoming film "Jumanji: The Next Level," which sees her reprise her role as Martha from the film's 2017 predecessor.

"The way I approached this character and where she’s at now is that she kind of got a fresh start," explained the Scottish actress. "She was able to reinvent herself by going to university, but actually, what she ended up doing was trying on a few different personalities and maybe, underneath it all, feeling like a little bit of a fraud. Because she’s like, 'Am I being true to myself?' That’s how I came towards this character this time around, and I think the game knows. It sent her into the same avatar to send her on this journey of rediscovering herself."

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"Jumanji," also starring Dwayne "The Rock" Johnson, Kevin Hart, Jack Black and more, hits theaters on Friday.