The Big Bang Theory on CBS has been on the air for 10 seasons, and it’s about to get a big jolt of lightening in the form of its latest guest star. Christopher Lloyd will appear on The Big Bang Theory this December. The Back to the Future star won three Emmys for his role on the comedy Taxi, so this will be quite a treat for television viewers. Christopher will join the cast of The Big Bang Theory that includes Jim Parsons, Kaley Cuoco, and Johnny Galecki.