With lives hanging in the balance, Harry is put to the test.

Brokenhearted when Asta ends their friendship after discovering the real Harry’s fate, the alien decides to fulfill his original mission.

To repair his planet-killing device, Harry visits an alien convention to harvest implants from UFO abductees. Mike asks Liv to rejoin the department.

Harry and Asta team up with an unlikely ally to try to save the Earth.

A surprise visitor gives Harry an introduction to marriage, a stressful human institution he needs to familiarize himself with.

Harry comes face to face with his greatest enemy and makes a choice that may affect Earth forever.

Harry enlists an unlikely ally to help him save Patience.

Stranded in the town of Patience, Colorado, an alien inhabits the body of Dr. Harry Venderspeigle — but one resident can see past his façade.

Harry travels to the Ute Reservation to help Asta's grandmother, and along the way, learns what it means to belong to a community.

After he makes a mess of his human life, a depressed Harry gets drunk. Liv quits the force when Mike fails to credit her for solving a crime.

Asta saves a badly injured Harry after they fall into a glacial crevasse — and in the process learns a shocking secret.

Harry has an unexpected partner as he tries to infiltrate a military base to find his alien baby. Meanwhile, Asta and Dan help D'arcy to recover and realize, that she's unwilling to leave her new comfort zone.

Harry and Asta get surprise visits. Ben grows suspicious of Mike and Liv's private investigation.

It's a surprise party as everyone gathers to celebrate Harry, but some dangerous guests cause havoc.

D'Arcy inserts herself into Harry's mission, while Kate grows more uncomfortable in her own home.

In his first week at the clinic, Harry struggles to diagnose a strange feeling: human emotion.

Harry copes with jealousy when the mayor hires an annoyingly perfect new town doctor.

Harry and Asta find what they are looking for but not what they need as danger closes in.

Harry gets distracted from his mission, while Mike and Liv make a huge discovery.

Harry races to keep his secret safe as Asta is forced to face her own past.

Halloween comes to Patience, and Harry sheds his human mask. Meanwhile, Ben is trying to promote the new resort to the residents of Patience and meets some resistance.

Harry tags along on Ben, Kate and Max's family trip, hoping the mayor will lead him to answers.

After losing the alien baby, Harry learns which alien race is on Earth and it’s not what he expected.

In an attempt to gather information on the Grey Aliens, Harry puts Asta in harm's way.

Harry the alien is back on Earth and doesn't remember who he is, and only Asta can keep him safe.