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

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

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

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

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

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.