Lloyd's foremost major motion picture role was as a psychiatrical patient around ''One Flew Over the Cuckoo's Nest. Nevertheless, he can be virtually all remembered for his roles when Reverend Jim Ignatowski, a ex-hippie cabbie on the TV sitcom Taxi and as a nonconcentric inventor Emmett "Doc" Brown in the Back to the Future trilogy of movies.

More guiding light roles for Lloyd were a Klingon Commander Kruge in Star Trek III: The Search for Spock and the villain Judge Doom in Who Framed Roger Rabbit.

Lloyd likewise appeared when a lead character in the computer game Toonstruck''. He does a voice of The Hacker on the youngsters's cartoon indicate Cyberchase on PBS.

He seldom appears publicly & doesn't give interviews.

Filmography
''One Flew Over the Cuckoo's Nest (1975) Taxi (1978) Star Trek III: The Search for Spock (1984) The Adventures of Buckaroo Banzai Across the 8th Dimension (1984) Back to the Future (1985) Clue (1985) Walk Like a Man (1987) Who Framed Roger Rabbit (1988) Back to the Future Part II (1989) Back to the Future Part III (1990) DuckTales: The Movie - Treasure of the Lost Lamp (1990) Suburban Commando (1991) The Addams Family (1991) Dennis the Menace (1993) Addams Family Values (1993) Angels in the Outfield (1994) Camp Nowhere (1994) Things to Do in Denver When You're Dead (1995) Quicksilver Highway (1997) Anastasia (1997) My Favorite Martian (1999) Baby Geniuses (1999) I Dream (2004) Stacked'' (2005)