Robert Sean Leonard Robert Sean Leonard

House's Robert Sean Leonard is heading back to television.

Leonard has joined Falling Skies' third season for a five-episode stint, TV Line reports. The actor will be playing Dr. Roger Kadar, a scientist in charge of Charleston's power grid who lives underground with his pet rats. His strange living situation leads to the nickname "The Rat King." This role marks Leonard's first gig since House ended last spring.

TNT orders third season of Falling Skies

Additionally, the TNT drama has also cast Gloria Reuben for a five-episode arc. Reuben will play the politically savvy aide to her former ER co-star Noah Wyle's Tom Mason.