“I am Groot.”

They are the only three words Vin Diesel needs to say as the voice of Groot, but after catching his first glimpse of Guardians of the Galaxy Vol. 2, he was at a loss for words. He eventually found them, with his key word for the film being “necessary” and saying of director James Gunn (who was sitting next to Diesel), “My friend is a genius.”

Diesel and Gunn go on to discuss how everyone in the film has upped their game from the original Guardians of the Galaxy in 2014. Watch the full video above and let me know what you think in the comments!