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.
Season Three, Episode Five.
Some former police officers take over the Professor's house to prove a point.
Season One, Episode Five.
Thorne and the Professor investigate a crashed space ship, looking for answers.
Season Five, Episode Seven.
K9 loses even more of his memories.
Season Three, Episode Six.