The 47-year-old star insists the innocence of his alter-ego Groot, a genetically modified tree who tries to save the world, in the new Marvel flick is comparable to his own off-screen persona, reported Contactmusic.
"To maintain your innocence is a feat. So much magic comes from it. Ironically, people probably see more of Groot when I'm posting (on Facebook) than they would in any of the characters I play," he said.
'Guardians of the Galaxy', which also features the likes of Zoe Saldana, Bradley Cooper and Chris Pratt, released in UK on August 1.