Hugh Dancy, Parker Posey

British actor Hugh Dancy and indie film darling Parker Posey will guest-star on the second season of The Big C, Showtime announced Thursday.

Dancy will appear in at least six episodes, playing a cancer patient who befriends Cathy (Laura Linney). Posey will play Poppy, a woman who has a surprising relationship with Cathy's teenaged son Adam (Gabriel Basso).

Alan Alda, who was announced previously, will play Cathy's oncologist Dr. Atticus Sherman.

Alan Alda to guest-star on The Big C

Season 2 of the acclaimed series will return on Monday, June 27.