'Laugh-In' Star Alan Sues -- Dead at 85

Comedian Alan Sues -- who starred in "Rowan & Martin's Laugh-In" back in the 70s -- has died, TMZ has learned

Alan -- who also appeared in the infamous 1964 Twilight Zone episode "The Masks" (below) -- passed away last night. So far, a cause of death is unknown.

"Laugh-In" creator George Schlatter tells TMZ, "Alan was a dear man and good friend, and a forcefield of energy and laughs. Every situation he was in added an element of humor and danger because you never knew what he was going to do, but you knew it was going to be funny."

Alan was 85.