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

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

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

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