Decades after promiscuous teen Mary Lou Maloney (Lisa Schrage) dies during a prank gone wrong, she returns as a spirit out for revenge and eager to punish the culprit, her one-time boyfriend, Billy Nordham (Michael Ironside), who is now high-school principal. Evil Mary Lou is perfectly content to kill other locals, and she eventually possesses the body of prom queen contender Vicki Carpenter (Wendy Lyon), which allows her to wreak even more havoc.

A robotic companion's emotional shortcomings prove dangerous when a paraplegic scientist becomes involved with his therapist.

Two brothers wrestle for control of their late father's pharmaceutical company and a newly discovered vaccine.

In a chaotic world suffering from a scarcity of water, the sliders (John Rhys-Davies, Jerry O'Connell, Sabrina Lloyd, Cleavant Derricks) search for a hidden treasure.

Quinn is mistaken for a man with special powers when the sliders land on an Earth populated with dragons and castles.

Sam takes the existence of a sibling-tormented 13-year-old whose mother (Sandy Faison) contemplates divorce.

Sam becomes an unwed, pregnant 16-year-old who must convince the baby's father to help her support it.

The Cylons confront the taboo mystery of the Final Five; Kara is pushed too far.

Kara Thrace searches for Earth, while political intrigue and marital discord are paralleled by rifts in the Cylons' solidarity.

A parasitic presence inside the SG-2 leader's head causes him to run amok.

A trade for weapons has a profound impact on the lives of the inhabitants of planet Simarka.

A virus on another world turns intelligent people into primitive beings.

While investigating a murder, Garibaldi uncovers an assassination plot and gets shot; a Centauri attack on a Narn outpost kills 10,000 Narn warriors.

Sinclair is reassigned and a new commander arrives at the station as Garibaldi remains in a coma and Delenn continues her transformation.

Londo becomes more entwined with Morden; Dr. Franklin tries an alien experimental procedure on the comatose Garibaldi; Delenn emerges from her cocoon.