Resident Alien season 3 premiered on February 14, 2024, on Syfy and is available for streaming on Syfy's website. The season continues Harry Vanderspeigle's exciting and funny journey. He is an alien who crash-lands on Earth and must learn to cope with human emotions while attempting to save the world from a deadly alien threat.
Season 4 of Resident Alien is set to release on June 6, 2025. This season will premiere on Syfy and USA Network simultaneously. The show continues to expand its universe, bringing new alien threats and exploring deeper connections among the characters. Fans can expect even more action-packed episodes as the series progresses.
The premise of Resident Alien revolves around an alien, Harry Vanderspeigle, who crash-lands in Patience, a small Colorado town. Originally sent to eradicate humanity, Harry, disguised as the town doctor, gradually starts to sympathize with the people and ultimately defends them against other alien threats.
The series explores Harry's complex relationship with the Patience people and the challenges of balancing his mission with his new personal relationships.
Everything to know about Resident Alien season 3 before season 4 drops

In Resident Alien season 3, Harry is deeply embedded in the town of Patience, Colorado, where he works as the town's doctor. His goal has changed from eradicating mankind to saving it since he learns of a sinister scheme by the Grey aliens to change the composition of the Earth.
Led by a merciless scheme to set off a catastrophic geyser eruption in Yellowstone National Park, these aliens jeopardize the existence of all human life. Harry teams up with other alien entities as well as his human allies to stop them and creates a bomb able to thwart the alien scheme.
Meanwhile, Harry grapples with new emotions, particularly love and heartbreak, as he falls for an alien named Heather. However, Heather’s betrayal, when she joins the Greys and leaves the planet, devastates him. However, it also helps him better understand human emotions.
This emotional journey is a key element of the season, as Harry's transformation from a cold, calculating alien to someone who values human life becomes central to the plot.
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Key events of Resident Alien season 3

As the season progresses, multiple plotlines unfold. Ben and Kate, the town’s mayor and his wife, are targeted by the Greys, who have been abducting them and even stealing their unborn child for research. Kate’s memories of these abductions are erased, but Harry helps her regain them. Determined to retrieve her baby, Kate joins Harry’s mission, leading to intense moments of tension and drama.
D’arcy Bloom, another central character, deals with personal issues from her past, particularly her failed dreams of Olympic skiing. Her journey of self-discovery culminates in her stealing Harry’s bomb and heading to Yellowstone to destroy the Grey’s operation.
Meanwhile, Sheriff Mike and Deputy Liv continue their investigation into the alien phenomena in their town, with the former finally encountering an alien firsthand.
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Season 3 finale: Homecoming
The season finale, Homecoming, leaves viewers on a cliffhanger. The situation gets much more dire when it is discovered that the Grey mothership, masquerading as the Moon, is still a major threat, even while Harry and his friends momentarily foil the Greys' intentions.
The season finishes with Harry and his alien son, Bridget, imprisoned on the mothership, and the dangerous Mantid alien shapeshifter takes center stage in the next one. This sets the stage for major challenges for Harry and the people of Patience in the coming episodes.
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What to expect from season 4

Season 4 of Resident Alien will explore the consequences of the shocking revelations from the season 3 finale. The Grey mothership, hidden in plain sight as the Moon, is one of the most significant plot twists in the series. This new information will undoubtedly lead to Harry and his allies facing even greater challenges as they plan their next move to stop the Greys for good.
The season will also delve deeper into the characters’ growth. Sheriff Mike, who previously denied the existence of aliens, now has undeniable proof that they are real. His character arc will likely evolve as he becomes more involved in the fight against the Greys. Additionally, Harry's bond with his alien son, Bridget, will continue to develop, especially given the emotional stakes set up in season 3.
Moreover, the Mantid, a new formidable villain, will play a crucial role in the conflict. With his shapeshifting abilities and violent nature, the Mantid presents a unique threat to Harry and his friends.
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Production, direction, and cast
Resident Alien is created by Chris Sheridan, who also serves as the showrunner. Renowned for his work on Family Guy, Sheridan has added a special fusion of comedy and drama to the show. Season 3's production had certain difficulties, including a drop in the episode count.
Alan Tudyk plays Harry Vanderspeigle on the show; his comic timing and depth have drawn many compliments. The attraction of the show stems mostly from Tudyk's portrayal of an alien experiencing human emotions. Other important cast members are Alice Wetterlund as D'arcy Bloom, whose personal challenges give the show emotional weight, and Sara Tomko as Asta Twelvetrees, Alan Tudyk's human friend.
Season 3 also featured Linda Hamilton as General McAllister, a new character who plays a crucial role in Harry’s efforts to stop the Greys. The addition of Enver Gjokaj as Joseph Rainier, a Grey-human hybrid, further expands the alien lore, making the stakes even higher for the characters.
Stay tuned for more news and updates on Resident Alien and similar projects as the year progresses.