Join or Sign In
Sign in to customize your TV listings
By joining TV Guide, you agree to our Terms of Use and acknowledge the data practices in our Privacy Policy.
Years after having their memory wiped, two spies must work to stop an evil syndicate while piecing together the remnants of their past.
There are no TV Airings of Citadel in the next 14 days.
Add Citadel to your Watchlist to find out when it's coming back.
Check if it is available to stream online via "Where to Watch".