Today we’re learning about a new person joining the cast of AMC’s Mad Men!

Relatively unknown actor Ben Feldman will begin a stint on the show during this Sunday’s new episode, reports Deadline:

Like everything related to Mad Man, Feldman’s character is shrouded in secrecy but I hear he is playing a new employee at ad agency Sterling Cooper Draper Pryce. He will make his debut on the show on Sunday.

There’s no word on how long he’ll be involved with the show just yet.