Peri Gilpin will return to series television for the first time since NBC's Frasier went off the air in 2004, after an 11-year run, when she guest-stars on the Mar. 7 episode of Medium. Gilpin will play a 17-year-old Allison's mother in a flashback, as Medium further delves into how Patricia Arquette's alter ego began to recognize her gifts. Gilpin's former Frasier costar Kelsey Grammer, of course, is an exec producer on Medium. - Reporting by N.F. Mendoza