After Eight Seasons, Homeland Comes Full Circle in its Series Finale

In a storyline that mirrors its very start, the final season of Homeland has seen its hero suspected of having become a brainwashed double-agent turned by the enemy. As the series comes to a close tonight, we expect to learn whether Carrie Mathison (Claire Danes) has in fact betrayed country and her mentor Saul Berenson (Mandy Patinkin), but this being Homeland, here's guessing the answer will take us somewhere unexpected. Also tonight: a Penny Dreadful series pursues a killer in the City of Angels, American Idol airs its first remote episode, and Villanelle returns to London on Killing Eve. Here's what's new and noteworthy on TV this Sunday:

SERIES FINALE: The stakes have never been higher on Homeland, as the series signs off with an episode that promises to reveal the intertwined fates of Carrie, Saul and the world as we know it. Watch the preview. 9:00 PM ET on Showtime

SERIES PREMIERE: In the premiere of Penny Dreadful: City of Angels, Detectives Tiago Vega (Daniel Zovatto) and Lewis Michener (Nathan Lane) investigate a murder in 1938 Los Angeles. Watch the trailer. 10:00 PM ET on Showtime

NEW EPISODE: In the series' first remotely-filmed broadcast, American Idol returns with its final 20 contestants, Katy Perry, Luke Bryan, Lionel Richie and Ryan Seacrest all adhering to social distancong rules in their own homes. 8:00 PM ET on ABC

SEASON PREMIERE: Returning for its third and final season, Vida sees Lyn (Melissa Barrera) and Emma (Mishel Prada) pushing their relationship into new territory. Watch the trailer. 9:00 PM ET on Starz

NEW EPISODE: With only two episodes remaining in Westworld's third season, those who were followers must learn to lead. Watch the preview. 9:00 PM ET on HBO

NEW EPISODE: An assignment brings Villanelle (Jodie Comer) back to London on Killing Eve. Meanwhile, Eve (Sandra Oh) follows a lead to The Twelve. Watch the preview. 9:00 PM ET on AMC

SEASON FINALE: Lee (Kavan Smith) hears startling news on the season finale of When Calls The Heart. Meanwhile, Lucas (Chris McNally) hopes to protect his petroleum investment. 8:00 PM ET on Hallmark

Mike Attebery is Senior Editor at Primetimer and the author of seven mystery thrillers. Follow him on Twitter at @mikeattebery.