Nash must stop a sniper terrorizing the city by shooting victims at random. A rat infestation forces Joe to confront his ""landlord,"" Nash, about the problem. Evan proposes to Cassidy, but in the wake of a serious traffic accident, Cassidy is left fighting for her life.
Frank and Emma investigate the suicide of a former FBI agent and discover links between the FBI, the Millennium Group, and the Los Alamos nuclear research center.
Dr. Neal Eberhardt (Ralph Macchio), a former boy genius gone bitterly toseed, studies brain-damaged and comatose patients hoping to learn how the brain reroutes itself. Despite having a revolutionary new machine to work with - the Neural Intercortex Stimulation Array or NISA - Dr.Eberhardt is getting nowhere. To make matters worse, his valued assistant Vince Carter has just quit. But suddenly, Neal has a breakthrough.
Danvers brings news of his appointment to the District Court bench as the investigation of a government official named Janine McBride continues in New York. Their prime suspect Chesley Purcell is dead and her shooter is in the hands of the Feds. The Baltimore detectives investigate the background of Chesley Purcell and it turns up the name of a man in prison who still appears to be running his organization. This crossover starts on Law and Order S09E14 Sideshow (I).
A group of primitive aliens begin to fall deathly ill after SG-1 arrives.
Roland the Troll resurfaces in a new guise as a leprechaun, and chaos predictably follows. Having three wishes, Sabrina unwisely uses one of them to grant Salem's desire to be human again for a day.
Niles hires an aggressive new divorce lawyer who may wind up exposing his long-running crush on Daphne.
Greene assists paramedics in treating injured children at a school bus accident. En route, Doug and Jeanie survive their own accident. Kerry stops Doug from treating Jeanie...or any other patient. Doug decides to resign and leave Chicago for the Northwest and asks Carol to come with him. She decides against it, but he leaves anyway. Carol steps down from running the clinic so that Anspaugh will keep it open. Jeanie discovers she may have contracted hepatitis. Hospital janitor Mobalage's wife is stabbed.
After picking up the GS Ball from Professor Ivy, Brock decided to stay on the island so Ash and Misty head back home by blimp. Unfortunately, our duo gets double-crossed by Team Rocket once again, and Jigglypuff puts the whole crew to sleep. After another crash landing in the middle of nowhere they meet a new friend named Tracey while trying to help a Lapras that washed up on the beach.
Marlon and Shawn get in way over their heads when they start competing for the attention of Dawn, an attractive psychiatrist who's just moved into the building.
Thanks to the nanobots, the Red Dwarf is back in business with its original crew on board, which means Rimmer is alive and well.
Joey starts dating Katie, a little girl who packs a mean punch. When Ross refuses to contribute to the retirement fund of the building's maintenance man, he winds up offending everyone in the building. Meanwhile, Chandler freaks out about his relationship with Monica.
Cliff's Neice comes to town for a visit, but Cliff needs a replacement babysitter (Lube was supposed to, but he was unable), so Cliff makes CatDog do it.
Megatron is building a disruptor ray to scramble the Maximals' circuits, but needs an organic lifeform who won't be affected by it to finish putting the shielding into place. He has one of the cave-human children kidnapped, and it's up to Rattrap and Depthcharge to save her.
When Briscoe and Curtis discover that a high-level federal official found murdered was recently transferred from Baltimore, they re-team with Baltimore homicide detectives. The joint investigation reveals that the victim was involved in an affair with a high-level government official whose career will be destroyed if it becomes public. The independent counsel summons McCoy and Ed Danvers to Washington to demand McCoy reveal his source or be jailed for contempt. This crossover continues on Homicide: Life on the Street S07E15 Sideshow (II).