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.

NEWS: Kurt Russell's Entire Life Has Been Leading Up to 'Guardians of the Galaxy Vol. 2'

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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