In the upcoming feature-length comedy directed by Greg Mottola ("Superbad"), David plays a marketing executive who gives up his stock in a start-up electric-car company after a petty argument with his boss, played by Hamm.
See video: Larry David Is Unrecognizable in HBO's 'Clear History' Teaser
The petty argument may or may not be over the name of the company's product, which ends up making the company billions of dollars, while David's is publiclity humiliated after making a decision that leaves his life in shambles.
Ten years later, David has changed his name and moved to a small island off the coast of Massachusetts, where all is well until something from his past threatens the new life he's made for himself.
Watch what appears to be the moment David's character's life stars to fall apart: