Resident Alien is a Syfy comedy series based on the eponymous comic series by Peter Hogan and Steve Parkhouse, published by Dark Horse between 2012 and 2018. The central storyline follows an extra-terrestrial pilot who assumes a new identity on Earth and awkwardly tries to assimilate. Set in Patience, Colorado, Resident Alien revolves around a murder mystery in a small community. The local authorities are highly suspicious of Dr. Harry Vanderspeigle, who is indeed an alien but may not necessarily be a killer.

As Sheriff Mike Thompson and Deputy Liz Baker investigate a local man's death, Dr. Harry tries to cover up the fact that he's actually Captain Hah Re, which allows for some dry humor and black comedy. Given that Resident Alien has a Fargo-like vibe, it makes sense that SyFy enlisted one of the cast from the popular FX series. And since the titular role requires some spectacular voice acting, a Star Wars alum was cast to portray the socially-awkward intergalactic doctor.

Alan Tudyk As Captain Hah Re/Dr. Harry Vanderspeigle

Birthdate: March 16, 1971

Character: Alan Tudyk stars as Captain Hah Re, an alien biologist who crashes in the United States and forms a new life as Dr. Harry Vanderspeigle. He opens Resident Alien by killing the real Dr. Vanderspeigle, and his job is to destroy the human race. However, the more people he meets on Earth, the less willing he is to harm humanity. He begins working as a medical examiner and takes humanity's side when protecting them from possible destruction.

Actor: Alan Tudyk has long been a popular character actor in mainstream TV and feature film comedies. Tudyk portrayed Hoban "Wash" Washburne in Firefly and later appeared as Pastor Veal in Arrested Development and Gary in Santa Clarita Diet. In recent years, Tudyk voiced several characters like Clayface and Joker in Harley Quinn and Doctor Phosphorus in Creature Commandos. He's also well known for voicing K-2SO in Rogue One: A Star Wars Story. He also had prominent roles in Dodgeball: A True Underdog Story, A Knight's Tale, and Tucker & Dale vs. Evil.

Corey Reynolds As Sheriff Mike Thompson

Birthdate: July 3, 1974

Character: Corey Reynolds co-stars as Sheriff Mike Thompson, a Patience lawman who loves pugs and investigates the alien mystery. He calls himself "Big Black" and is someone who feels the need to remain in control of every situation, which is difficult as the mysteries of the aliens and possible invasion start to pile up. He also has a dog named Cletus, an animal that belonged to his former partner, who died in Washington, D.C.

Actor: Corey Reynolds is best known for his work on the stage, as he originated the role of Seaweed in the Broadway adaptation of Hairspray. His first big break on television came after a guest starring role in The Guardian, which led to him taking on the role of Detective Sergeant David Gabriel in the Kyra Sedgwick police procedural series The Closer. Fans might also recognize Reynolds from his roles in the movies Selma and Straight Outta Compton and the TV shows Murder in the First and All American​​​​​​.

Elizabeth Bowen As Deputy Sheriff Liv Baker

Birthdate: Unknown

Character: Elizabeth Bowen portrays Deputy Sheriff Liv Baker, a colleague of Sheriff Mike Thompson who helps with the alien investigation. She was a recurring actress in the first season before moving into the main cast in season 2. This also reveals her importance as the show goes on as the sheriff starts to see her value over time, and they work more in tandem. She is also someone who has always been interested in aliens since she believed she saw one as a child.

Actor: Elizabeth Bowen is an actress who started her career on TV in 2000. However, it wasn't until 2015 that she gained widespread attention thanks to her role in Fargo as SD Trooper Sue Lutz. This led to her earning more television roles on shows like iZombie, Wayward Pines, No Tomorrow, Loudermilk, Michelle's, , and Family Law. Most recently, she had a three-episode run on the 2024 series Laid.

Sara Tomko As Asta Twelvetrees

Birthdate: October 19, 1983

Character: Sara Tomko portrayed Asta Twelvetrees, the assistant to the town doctor at the Patience health clinic. She was the second person to learn about Harry's true identity in the series (after the young child Max, who actually saw through Harry's disguise). Asta is a member of the Ute Native American tribe, and she is the mother of Jay, who she put up for adoption when she was a teenager.

Actor: Sara Tomko has a limited history in movies and TV shows. Before Resident Alien, she appeared in only five movies, with almost all of them being sci-fi films, including Asylum's Journey to the Center of the Earth, 2012: Doomsday, and The Terminators. She had several one-episode roles on TV shows, including The Leftovers and S.W.A.T., a four-episode run on Once Upon a Time, and a two-episode run on Sneaky Pete as Suzanne.

Alice Wetterlund As D’arcy Morin

Birthdate: May 16, 1981

Character: Alice Wetterlund plays D'Aarcy Morin in Resident Alien. She owns the town pub and works there as a bartender. She was also a professional skier until a skiing accident at the Olympics caused her to return to her hometown and start her post-athlete life. She learns who Harry really is after she discovers the truth that the original Harry was a murderer who killed Sam Hodges, the town's original doctor.

Actor: Alice Wetterlund got her start in entertainment as a stand-up comedian in the late 2000s, working with the world-famous Upright Citizens Brigade Theatre. This helped her pick up a role in MTV's Girl Code. She had a small role in the Seth Rogen comedy movie The Interview, but she had more success on television. She starred as Carla Walton in Silicon Valley, and Kelly Grady in People of Earth, and had guest appearances on Take My Wife, GLOW, Single Parents, and Space Force.

The Resident Alien ing Cast

Levi Fiehler as Ben Hawthorne: Ben is the Mayor of Patience. His wife, Kate, dominates their relationship, but he still seems interested in D'Arcy, who he dated in high school. Shockingly, the gray aliens have abducted him regularly since he was a child. He is also Max's father. Levi Fiehler portrayed Troy Johnson in The Fosters and Cameron Pate in Mars.

Meredith Garretson as Kate Hawthorne: Kate is Ben's dominating wife and Max's mother. She works as a school teacher. Garretson portrayed Bridget in Fosse/Verdon and Kimberly in Prodigal Son. She also starred in The Offer in 2022 as Ali McGraw and played Delores Winters in Stargirl.

Judah Prehn as Max: Max is Ben and Meredith's son. He plays a big role in the series as he is the only person who can see through Harry's disguise and knows that he is an alien all along. Judah Prehn portrayed Liddo in Kinderwood and had a four-episode run in the show Kid Tips in 2023.

Linda Hamilton as General McCallister: Linda Hamilton stars as a high-ranking U.S. military officer who secretly works for an unknown organization dedicated to hunting extraterrestrials. She has spent much of her life hoping to prove aliens exist. Hamilton famously starred as Sarah Connor in The Terminator and reprised her role in Terminator 2: Judgment Day. During the late '80s, she also portrayed Catherine Chandler in the Beauty and the Beast series opposite Ron Perlman.

Mandell Maughan as Lisa Casper: Mandell Maughan played Lisa in the first two seasons of Resident Alien, a government agent working for General McCallister. She is mostly an evil character who has no problem killing anyone who crosses her and wants to kill more. Maughan portrayed Victoria King in Bajillion Dollar Propertie$ and Maggie in Me, Myself and I.

Alex Barima as David Logan: Alex Barima stars as a lieutenant in the U.S. Air Force who works for General McCallister. He is asked to capture Harry before anyone else can figure out who he is. Barima appeared as Johnathan in Riverdale and Reeve in The Hollow. He also voiced the main role in the cast of Daniel Spellbound as the titular character.

Jenna Lamia as Judy Cooper: Jenna Lamia plays Judy Cooper in Resident Alien, a woman who works at the bowling alley. Lamia portrayed Sherri Ward in The Fighter and Leslie Miller in Awkward. She also appeared as Marcella in Legend Quest: Masters of Myth. She also developed the Netflix series The Perfect Couple and worked as its showrunner.

Nathan Fillion as The Voice of 42: Nathan Fillion took on the Voice of 42 in the second and third seasons. He is an octopus stranded in a restaurant tank (and on its menu) who can communicate telepathically with Harry. Fillion remains a popular actor in Hollywood and on TV. He has starred in TV shows Firefly, Castle, and The Rookie and has movie roles in Slither, Deadpool & Wolverine, and Skincare.

Terry O'Quinn as Peter Bach: Terry O'Quinn plays Peter Bach in Resident Alien. He is an "alien experiencer" who has a podcast. Like Max, he can see Harry's true form. Most fans know O'Quinn for his role as Locke on the hit TV series Lost. He also appeared in The Rocketeer, Young Guns, Tombstone, Primal Fear, Alias, and Hawaii Five-O.

Edi Patterson as "Heather": Edi Patterson plays "Heather" on Resident Alien. She is a Blue Avian alien from the Galactic Federation who becomes romantically involved with Harry. Patterson is best known for her role on the HBO comedy series The Righteous Gemstones, where she plays daughter, Judy Gemstone. She also appeared in Knives Out and in the HBO series Vice Principals.