Chris Pratt Reveals the Only 3 Looks You Need to Be an Actor on the Set of 'Guardians of the Galaxy Vol. 2'

Guardians of the Galaxy Vol. 2 is poised to be one of the biggest blockbusters of the summer, and Jimmy Kimmel's sidekick, Guillermo, was given a part in the sci-fi spectacular!

On Monday's Jimmy Kimmel Live, Guillermo headed out to Pinewood Studios in Atlanta, Georgia, and took fans behind the scenes of the epic Marvel project for an exciting look at the long-awaited sequel.

WATCH: Chris Pratt Is Ridiculously Charming as He Gives a 'Guardians of the Galaxy 2' Set Tour

While on set, Guillermo also met up with a few of the movie's biggest stars to get some acting tips -- starting with Chris Pratt, who told the talk show sidekick that acting really comes down to just a few simple expressions.

"There's three looks," explained Pratt, who stars as "Star-Lord" Peter Quill. "The first one: Happy; The next one: Sad; and then the third one: Scared. That's all you need."

As he listed off the looks, Guillermo tried his best to pull them off, with varying degrees of success, and asked about another important expression: "What about sexy?"

"Just use scared," Pratt suggested.

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Later, Guillermo ran into Kurt Russell, who plays Quill's father, Ego, and the veteran action star -- decked out in his full, awesome GotG2 costume -- had one simple piece of advice: "Just remember this one thing -- whatever you do, don't f**k up."

The hilarious set tour also gave a sneak peek at Guillermo's cameo in the adventure saga in which he plays a police officer -- and it's a real challenge for everyone involved. Check out the clip to see how his first real acting gig turned out.

Guardians of the Galaxy Vol. 2 explodes into theaters May 5.

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