Moya arrives at Earth in present day, Christmas. The crew show their ships and technology to Earth's scientists. Crichton starts writing a journal. The creature left on board Moya by Grayza manages to get to Earth where it starts killing and hunting down Crichton.
The team returns to Earth with a piece of technology that allows them to see alien creatures everywhere, and must attempt to contain the problem when it spreads beyond the base.
Emma and Sean are back together. Emma invites Sean to come to dinner at her house with Mrs. Nelson and Mr. Simpson and Emma. Sean arrives drunk and gets kicked out. Emma cheers him up and assures him she still has faith in him. Emma's parents forgive him.
Dr. Weaver is in a difficult situation when an alderman tests positive for syphilis. Dr. Carter is impressed when he meets a man who runs an inner city clinic.
Ash's newly caught Treecko may be a bit standoff-ish, but the little green Pokémon is quite a fighter. When Team Rocket sees Treecko knocked down and hurt by a Seviper, they decide that they must have that Seviper. Jessie is very impressed with its "sneaky, snakey ways." Meanwhile, Treecko escapes from the Pokémon Center where Ash brought it to recover. When the gang finds Treecko, it is practicing its attack moves. Again and again, Treecko jumps from the top of a waterfall and tries to break a rock at the bottom with its tail. Ash is very impressed with the rigor of its training. All of Treecko's hard work appears to have paid off—when Team Rocket attacks and catches Pikachu with the help of their new Seviper, Treecko is able to save the day.
J.D. bonds with a patient, who is waiting for a heart transplant and discusses with her their idea of what death must be like. Elliot puts her foot down and demands a feminine locker room from Dr. Kelso. Turk decides it's time to propose to Carla, but a kid swallows the engagement ring.
Jack and the team search for a pregnant woman, Kathy Dobson, who disappeared from a hospital before being told that she has serious complications. As the detectives race against time to find Kathy, their investigation gradually reveals that Kathy's seemingly happy life actually hasn't been going very well. She is eight-and-a-half months pregnant and, under the tight control of her husband Paul, has withdrawn from her family and friends. Paul's brother Ritchie, who has been following Kathy and providing Paul with addresses she visits, lists a woman who may be affiliated with an ""underground railroad"" that helps battered women. When the team members find the woman, they learn that she has been assaulted by Paul—but she still refuses to lead them to Kathy.
Some bird watchers find a raven with a human eyeball in its beak. This eventually leads our CSIs to a divorced man and his 2 children but not much else. Warrick and Grissom look into the circumstances of David's unusual and first autopsy. This takes them to a car dealership where the man worked.
Gavin gives Rachel a very interesting birthday gift while Ross begs Joey to stay away from Emma's hot new nanny. Meanwhile, Mike meets and then accidentally murders Phoebe's unusual pet.
Naruto and Sasuke continue to fight Haku and are getting beaten bad. After having Naruto try and escape a few times, Sasuke begins to see a pattern. Meanwhile, outside Kakashi and Zabuza begin their fight. Can Naruto and Sasuke escape from Haku's jutsu? What plan does Zabuza have to defeat the Sharingan?
Back in LA, Dawson is asked by the studio to direct re-shoots but is conflicted about being disloyal to his mentor. Meanwhile, Joey hasn't heard from Eddie since Christmas and finds his apartment empty; Pacey starts skipping work to spend time with Emma; Jen's insecurities as a peer counselor are compounded when C.J. is assigned to train her.
The Lopez family finds out that Benny's estranged brother, Uncle Joe is dying. George and Angie convince Benny to reconcile with Uncle Joe-but Benny's more interested in getting Joe's Super Bowl tickets. Meanwhile, since Benny never taught George how to cope with death when he was younger, he has difficulty attending the funeral.
Connor gets locked inside Wolfram and Hart with the Big Bad doomsday beast, who turns the legal firms staff into an army of zombies.
While Toby unsuccessfully attempts to fill her shoes in the briefing room, C.J. returns to Dayton, where she gives a speech at her high school reunion, reconnects with an old friend, and struggles with her father's worsening Alzheimer's.
Will Truman and Grace Adler are best friends living in New York, and when Grace's engagement falls apart, she moves in with Will. Together, along with their friends, they go through the trials of dating, sex, relationships and their careers, butting heads at times but ultimately supporting one another while exchanging plenty of witty banter along the way.
The murder of a bookie with a high-class clientelle leads the detectives to arrest his partner. Charged with first-degree murder, his attorney puts forth an unusual defense strategy that turns the trial into a political statement.
Ed and Frankie represent a man who is suing his sister for ""outing"" him, even though he insists he's not gay; Carol goes looking for love in all the wrong places; by attempting to drive away all his patients, Dr. Jerome drives Mike crazy until Mike uncovers Dr. Jerome's real motivation in trying to drive him out of business.
Bernie and Jordan square off in a battle not quite of biblical proportions, but certainly of biblical content, as the youngster craftily uses the Good Book for manipulation when he believes he's being unduly punished. After a priest at school misinterprets Jordan's innocent questions about religion, he warns Bernie, who sentences the boy to intensive Bible study. But that backfires when Jordan cons younger sister Bryanna into being the standard-bearer for a crusade against sin—keeping his own hands clean when Bryanna dumps Bernie's liquor; rips up his celebrity photos (to combat idolatry); and tells on Wanda when she fibs.
At Professor Oak's lab, Tracey and the Professor are busy with their daily work. So busy that they don't even notice when a Team Rocket helicopter lands on the property—Butch and Cassidy are here, and they plan to steal all the stored Pokémon from the lab! While Ash's mom Delia stops by to say hello to Professor Oak, Butch and Cassidy put on Pokémon disguises and make their way toward the lab. The local Pokémon take an interest in these new visitors, thinking they're real Pokémon, but an Oddish realizes the newcomers are just people in costumes. Oddish alerts Bulbasaur, who decides to take action. It grabs Tracey and sends Noctowl to scout the area for signs of the intruders. By the time Tracey realizes what's going on, Butch and Cassidy have already looted the Poké Balls from the lab and left the building. Now they're back in their Pokémon disguises and headed for the helicopter, but they're slowed down by a lovestruck Nidoking and an affectionate Muk.