A French salvage ship searching for a lost WWII fighter plane unknowingly surfaces an alien which appears in the form of black oil and has the ability to jump hosts. Mulder heads to Hong Kong to investigate the salvage broker who sold the information to the French and he encounters Krycek, who has been selling information from the MJ documents. As Mulder prepares to take Krycek back to the US, the alien makes its way to Hong Kong and takes control of Krycek.
Amanda's cousin falls to his death when his motorcycle suddenly veers off the road. Amanda leads the investigation when it's discovered her cousin was drugged immediately before the accident.
Three youths, who were brought from Rwanda to act as mob hit men, are befriended by Father Torres. Moreno gets an inheritance; Williams disagrees with the methods of his son's hockey coach.
Humans turning into panthers (or panthers turning into humans), poachers, and Elisa's mother await the company as they arrive in Nigeria.
A TV sitcom, Buds, turns out to be less friendly than the producer hoped.
Joey buys a big screen TV and two leather recliners with his newfound money. Monica has a catering job for one of her parents' friends and becomes infatuated. Ross and Rachel attempt to have their first real date, but Rachel laughs every time they kiss. When they try again the next evening, they are interrupted when Ross is called into the museum.
George has a meeting with Marisa Tomei; the Cadillac Jerry buys his father sparks trouble for his dad.
George becomes obsessed with Marisa Tomei after he's told he's her type; Jerry gives his father a Cadillac.
Martin finds a bigger and better apartment for half the price they're paying now. So he decides to sublet his old place to a young couple, and move into the new place. But then the deal on the new place falls through, and it's too late to move back. Martin and Gina end up in the street! So they devise a scheme to scare off the new tennants. Tommy, Pam and Cole masquerade as dangerous criminals. The plan works nicely, and Martin gets his old crib back.
Benton decides to blow the whistle on Vucelich's unethical study methods, causing Vucelich to drop him from the study. Susan treats a street couple, one of whom has passed HIV to the other. Doug receives a visit from his estranged father. Carter spreads rumors about an affair between Mark and Susan. Mark buys a motorcycle. Prostitute Loretta has cervical cancer.
Billy and the young Rangers attempt to free the Alien Rangers from a toxic lake.
Billy and the young Rangers devise a scheme to outsmart the monsters.
Drew may have to terminate his affair with Lisa or risk job termination when the store bans interoffice dating. His solution? Ask Kate's boyfriend to pretend he's dating Lisa, to throw co-workers off the track.
After an argument with Shawn, Marlon decides it's time for him to claim his independence and move out. Marlon ends up rooming with White Mike, while Shawn takes in T.C. Unexpectedly, Mike and T.C. dump Shawn and Marlon as roommates, forcing them back together -- something we later discover was engineered by Pops, who wanted the boys to reconcile.
Gibby picks Martin to represent Whitestone at the Chicago Book Fair, informing him with one weeks notice. This means a ton of extra work and pregnant Toby doesn't really feel up to it, so Martin suggests they take on a temp to lighten the load. Toby offers up her cousin Louie, and although initially reluctant, Martin assents, giving him a trial period to prove himself.
Emily finds out about Charlie's affair and they break up. Kathleen tells him that she doesn't want to be just another girl, and wants to take their relationship ahead. Sarah is mad at Bailey because he didn't tell her about his college plans. Robin meets Sarah and tells her that she's leaving in two days. Sarah asks her to stay, and Robin gives Sarah her cat, promising that she'll be back. Claudia is trying to get closer to her grandpa, and she asks him to move into the house. Julia tells her how much their mother hated him for leaving her. Jake tells Julia that he wants to be a part of the family, and so she accepts him, thinking that their mother would have done the same. Jake moves in.
Worms, squid, clams, and flies are spineless creatures. They’re not afraid, they’re invertebrates – animals that don’t have backbones. Invertebrates are everywhere. You can find invertebrates in the sea, in freshwater, and on land. There are about 30 times more invertebrates than vertebrates on Earth.
When Tia and Tamera volunteer for community service at a retirement home, Tamera's charge Edgar (Berle) proves to be more than she can handle. Meanwhile, Ray's stint as a teacher turns into a snooze-fest for his students.