K9 and his friends work together to stop Thorne and a Korven invasion.
Season Four Finale
Thorne gets K9's regeneration circuit.
Affairs of the heart seem to be affecting Quark's entire family.
Picard looks into an accident at Starfleet Academy involving Wesley Crusher.
Some former police officers take over the Professor's house to prove a point.
Thorne and the Professor investigate a crashed space ship, looking for answers.
K9 loses even more of his memories.
K9 goes undercover in a robot fighting league.
Season Four, Episode Eight.