Patton Oswalt will return to Agents of S.H.I.E.L.D. in an episode set to air on 31 January 2017 entitled, Hot Potato Soup Patton will return as both Sam and Billy Koenig who are being hunted down by persons wanting to obtain the Darkhold.
Speaking to EW executive producers Jed and Maurissa Tancharoen also revealed, “Patton Oswalt returns as the Koenigs, and we finally reveal their family secret.”
Below is a photo from the episode.
Source: EW