Suggestions by @matthewcastle

Steven Yeun

as Sulu in Star Trek

Jon Bernthal

as Khan in Star Trek

Jon Berg

as Khan in Star Trek

Ryan Hurst

as Scotty in Star Trek

Emily Kinney

as Chekov in Star Trek

Andrew Lincoln

as Dr McCoy in Star Trek

Danai Gurira

as Uhurua in Star Trek

Sterling K. Brown

as Dr McCoy in Star Trek

Yang Yang

as Sulu in Star Trek

Finn Wittrock

as Spock in Star Trek

Sam Claflin

as Captain James T Kirk in Star Trek

Terry Rossio

as Writer in Star Wars: A New Hope

George Lucas

as Producer in Star Wars: A New Hope

J.J. Abrams

as Director in Star Wars: A New Hope

R2D2

as R2D2 in Star Wars: A New Hope

Chewbacca

as Chewbacca in Star Wars: A New Hope

Josh Gad

as C3PO in Star Wars: A New Hope

Ben Kingsley

as Darth Vader in Star Wars: A New Hope

Nikolaj Coster-Waldau

as Ben Kenobi in Star Wars: A New Hope

Danielle Rose Russell

as Princess Leia in Star Wars: A New Hope