As people pointed out the other one is Peter Mayhew - a gentle giant, I met him once he was so nice to his fans, he showed up as we were setting up the stage at a convention, and started to help us build it. my friends and i looked over at him, looked at each other then back at him and said "Sir aren't you Chewbacca?" he looked at us and made the chewie sound, then said "this looked like a job for a Wookie" - he spent the next hour helping and talking to all of us, even invited us to dinner after the convention.
He was an amazing person, his "stardom" never went to his head, I met a lot of actors from Star Wars and Star Trek, he was IMO one of a kind, you have Actors that are great to the Fans (Mark Hamil, Chris Pine) you also have some that are rude (William Shatner at least back in the 80's) then you have the special ones (Peter Mayhew, George Takei) that seem to really care about people as a whole.