Farscape - Season 4 Episode 22 -

The Scarrans know where the Wormhole to Earth is, and they're on their way. Crichton and crew race to the wormhole to stop them. But saving the Earth means destroying the chance for John to ever return home. Aeryn finally reveals the father of the baby. John and Aeryn decide to get married, but fate steps in. The finale for the television series.