Christopher Lloyd has to be one of the most underated actors ever. He played a superb nutter in One Flew Over the Cuckoo's Nest before doing various other bit parts, and then perhaps his most memorable performance was as the slightly crazy Doc in the fantastic Back to the Future trilogy.
Following this success Christopher Lloyd went back to largely doing bit parts until he starred in Things to do in Denver When You're Dead and played a strange character called Pieces.
I think that if you need a mad man in your film then Christopher Lloyd should be at the top of the list - he's great.
Do You Remember Christopher Lloyd?
Do You Remember Christopher Lloyd?