Christopher Lloyd Will Guest Star on 'The Big Bang Theory'

Dr. Sheldon Cooper is about to meet Doc Brown!

Back to the Future‘s Christopher Lloyd is set to guest star in a mystery role in an upcoming episode of The Big Bang Theory, CBS announced Wednesday (November 9).

“We’re so excited to be working with Christopher, and think we’ve created a fun part that fans will really enjoy!” the series’ executive producers said in a statement.

It was also recently announced that a Big Bang Theory spinoff about a young Sheldon Cooper (Jim Parsons) is being developed for CBS.

The episode featuring Christopher will air on December 1!