Bradley Cooper reveals that he had never met Guradians of the Galaxy co-star Vin Diesel before the pair teamed up to promote the film on a recent chatshow.
Cooper provides the voice for Rocket the racoon in the upcoming sci-fi adventure while Diesel voiced the character Groot, and he's admitted they never met while making the movie.
Appearing with his other co-stars - Zoe Saldana, Chris Pratt and Dave Bautista - on 'Jimmy Kimmel Live', Cooper said: "Yeah we just met ... For real, for the first time."
Meanwhile, Chris Pratt - who takes on the lead role of pilot Peter Quill in the James Gunn directed project - confessed his energy on set often got him into trouble with the crew, who were worried about their budget.
The 'Zero Dark Thirty' actor said: "I was truly playing every day. I had a laser gun and a spaceship ... a mask! It was funny, I would shoot this gun, this blaster, and over and over again they kept yelling, 'Cut'.
"Because, on the day, during the take, I was going [makes toy gun noises]. I was like, 'Come on, that felt really good to me'.
"And they were like, 'That just cost us a hundred and fifty thousand dollars! Stop with making the noise with your mouth'."
Guardians of the Galaxy is the second Marvel film to hit the big screen this year after Captain America: The Winter Soldier.
Guardians of the Galaxy is released 31st July.
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