The Mad Men actor will play himself on Matt Berry's brilliantly eccentric sitcom, Radio Times reports.
Hamm On Toast pic.twitter.com/9cvrdAqvGX
— Matt Berry (@porksmith) September 1, 2015
Matt Berry reveals details of Toast of London series three
Matt Berry on Toast of London ratings: "Hardly anyone watches on the night"
Hamm will appear in one episode of the forthcoming third series, coming to Channel 4 this autumn.
The actor is shown up by Berry's Steven Toast in the episode, after London's worst thespian refuses to acknowledge the Hollywood star out of arrogance.
Hamm has appeared in British TV before, having guest starred in Charlie Brooker's Black Mirror last year and Sky Arts' A Young Doctor's Notebook.
Berry previously revealed that Jurassic Park actor Sam Neill will also appear in Toast of London series three.