Note: To help refresh your memory, wiki links are provided for characters when available.
Lie To Me - "Honey"
Garret Dillahunt guest starred as 'Eric Matheson,' the greaving husband that held 'Cal' hostage. Terminator: The Sarah Connor Chronicles fans will recognize him as 'Cromartie.' He also played 'Roman Nevikov' on NBC's Life and 'Matthew Ross' on The 4400.
Castle - "When The Bough Breaks"
the forgotten - "River John"
Nicholas Gonzalez guest starred as 'Detective Garza,' the police detective who was helping 'Henry Morse' track down his wife and daughter before he was murdered. Previously, he played the role of 'Arturo Suarez' on Mental.
Criminal Minds - "Cradle To Grave"
Diana Scarwid guest starred as 'Jane Winmar,' the mother of one of the girls that was kidnapped and murdered and grandmother of two of the boys that survived. I thought she looked familiar, so I checked and it turns out she was 'Alice Shaw,' sister of 'Angela Petrelli' on the previous season of Heroes. She also guest starred on Prison Break as 'Jeanette Owens,' the owner of the house where the five million dollars was hidden.
FlashForward - "Gimme Some Truth"
Peter Coyote guest starred as 'President Dave Segovia.' Previously, he starred on The 4400 as 'Dennis Ryland,' the original supervisor of NTAC. He has also been a narrator for a few of the LOST recap episodes.
Dollhouse - "Belonging"