In point of fact, I'm not sure there are too many comedies with laugh tracks anymore. Most of what you hear is live studio audience laughing as a show is filmed. If this prompts you to wonder who those actual human beings are who are laughing at some of this stuff, that is a mystification I share.
It was 1976, and I was acting off-Broadway with a pair of Canadians: Victor Garber and Gale Garnett. The play was called 'Cracks,' and Martin Sherman, the man who wrote it, went on a few years later to have a giant hit with 'Bent.' But not this time around. Opening night was a disaster.
Doc Brown had a feverous imagination. He was constantly coming up with new ways and solutions to various issues, and time travel was one of them. I was just very inspired by being able to portray somebody of that sort. He's a man of tremendous energy and excitement about discovery.