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Resident Alien season 4 has returned in 2025, bringing a fresh chapter to the sci-fi comedy series. Based on the comic series Peter Hogan and Steve Parkhouse created, the show will broadcast on USA Network and Syfy.
Officially premiering on June 6, 2025, season 4 will also be available for streaming on NBC Universal's Peacock one week later. Returning to take front stage as Harry Vanderspeigle, the alien grappling with his moral conundrum of destroying Earth, is played by Alan Tudyk. As Harry negotiates fresh challenges, the next season promises more laughs, action, and emotional depth.
In this season, Harry faces captivity on the Grey moonbase while a shape-shifting alien known as the Mantid has assumed his identity on Earth. As Harry attempts to escape, his allies back on Earth fight to uncover the truth.
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The storyline delves deeper into the relationships between the characters, including Sheriff Mike Thompson’s growing belief in the existence of aliens. The addition of Stephen Root as Harry's father adds a new layer of conflict as he pushes Harry back toward his evil alien roots.
Resident Alien season 4: Full cast list explored
Alan Tudyk as Harry Vanderspeigle
Alan Tudyk reprises his role as Harry Vanderspeigle in Resident Alien season 4, an alien who lands in the small town of Patience, Colorado, and assumes the identity of a local physician.
His path explores his inner struggle between fulfilling his mission to wipe out Earth and developing relationships with the people he is supposed to destroy. Tudyk's performance as the eccentric alien blends human feelings with the character's actual alien nature.
Tudyk is known for his versatility in both live-action and voice roles. He has appeared in major films such as Rogue One: A Star Wars Story and I, Robot. Tudyk’s extensive voice work includes characters in Frozen and Moana.
Sara Tomko as Asta Twelvetrees
Sara Tomko plays Asta Twelvetrees, a local nurse and one of Harry’s closest allies. As Harry’s confidante, Asta is torn between helping him with his mission and keeping the secret of his true identity from the rest of the town. Asta’s emotional arc in season 4 will see her balancing her duties with the increasing tension surrounding Harry’s fate and the impending alien invasion.
Tomko has also starred in Heartbeat, The Son, and more.
Corey Reynolds as Sheriff Mike Thompson
Corey Reynolds plays Sheriff Mike Thompson, a tough and skeptical lawman who becomes increasingly involved in the alien mystery as the series progresses.
His incredulity about aliens becomes a hesitant awareness, and his part in season 4 is expected to change as he attempts to find the truth. Thompson's character will probably have great difficulties negotiating his employment with the strange events all around him.
Reynolds is widely recognized for his roles in The Closer and Murder in the First.
Alice Wetterlund as D'Arcy Bloom
Alice Wetterlund plays D'Arcy Bloom, a former hockey player turned bar owner, known for her wit and independent spirit. D’Arcy’s role in season 4 continues to bring levity and humor to the otherwise intense storyline.
Her relationship with the other characters, particularly Asta, adds emotional complexity to the series. Viewers can expect to see more personal growth and exploration of her backstory in this upcoming season.
Wetterlund has appeared in Silicon Valley and has done voice work in Star Trek: Lower Decks.
Also Read: Resident Alien season 4: Everything we know so far
Other cast and characters
Apart from the main cast, the supporting cast and characters of Resident Alien season 4 are listed below:
- Levi Fiehler as Ben Hawthorne
- Elizabeth Bowen as Deputy Liv Baker
- Judah Prehn as Max Hawthorne
- Meredith Garretson as Kate Hawthorne
- Gary Farmer as Dan Twelvetrees
- Enver Gjokaj as Joseph Rainer
- Clancy Brown as Mantid
- Stephen Root as Harry’s Father
Plot of Resident Alien season 4
The plot of Resident Alien season 4 kicks off with Harry imprisoned on the Grey moonbase. The alien known as the Mantid has taken over Harry’s identity on Earth, posing as him while trying to enact the alien mission. Harry’s escape from the moonbase sets the stage for an epic showdown with the Mantid.
Back on Earth, Asta, D'Arcy, and the rest of the crew work to keep the truth about Harry’s identity hidden, all while Sheriff Mike and Deputy Liv begin to unravel the mystery behind a series of strange deaths. Season 4 promises high-stakes drama, emotional arcs, and the signature humor that fans of the show have come to love.
As Harry's father makes his return, pushing Harry toward evil, the tension between good and evil becomes even more complex. Patience's characters will have more difficulties and their destinies will be connected to the struggle for the survival of Earth.
Read More: Alien: Earth trailer released - Details explored about the Alien franchise prequel
Production and direction
The production of Resident Alien season 4 has seen several changes and developments. Filming for the season began in December 2024 and wrapped up in March 2025. The show will now premiere on the USA Network, which marks a significant change in the platform but also offers an opportunity for a wider audience.
The budget for Resident Alien season 4 has been cut, but the production values should stay high, so fans can still expect the same sci-fi elements, special effects, and humor they love.
Alan Tudyk, known for his acting skills, takes on the role of director for the season’s premiere episode. The move to USA Network and Tudyk's direction show a commitment to keeping the series' charm while adapting to television's changing landscape.
Stay tuned for more news and updates on Resident Alien season 4 and similar projects as the year progresses.
