Rhys, left, with Anvari and Cookie Monster
Matthew Rhys (b. 1974) is a Welsh actor who found fame for his roles on Brothers & Sisters and The Americans. He subsequently starred on the 2020 Perry Mason series (as the titular character).
In 2025, while promoting the film Hallow Road at SXSW, Rhys and director Babak Anvari met with Cookie Monster.
Rhys' other TV credits include The Owl House and Gremlins, with guest parts on Archer, Girls, and BoJack Horseman. He's appeared in such films as Steven Spielberg's The Post (with Meryl Streep and Tom Hanks), Mowgli: Legend of the Jungle, A Beautiful Day in the Neighborhood, Cocaine Bear (directed by Elizabeth Banks), and Saturday Night (as George Carlin).