Katie Cassidy - Arrow, The Flash, DC's Legends of Tomorrow
Katie has been made a series regular across all three series (maybe four?), but we don't know in exactly what capacity as of yet.
Katey Sagal - The Big Bang Theory
Katey Sagal will be playing Penny's mother, a role she's somewhat familiar with because of a past role on 8 Simple Rules.
Jack McBrayer - The Big Bang Theory
Jack will also be a part of Penny's family, playing her brother
Archie Panjabi - Blindspot
Archie Panjabi will be the head of a secret division of the NSA which has been tracking the Jane Doe case.
Maya Rudolph - Brooklyn Nine-Nine
Maya Rudolph will be a US Marshal
Ken Marino - Brooklyn Nine-Nine
Ken Marino will be the new Captain of the 99 for a while.
TR Knight - The Catch
TR Knight will play a mystery character on The Catch.
Scott Elrod - Chicago Fire
Scott Elrod will appear on Chicago Fire Season 5 as “lifestyle” celebrity Travis Brenner