Greg and Sara work on a case of two university students who mysteriously end up dead in a dorm room. Catherine, Warrick, and Nick investigate the death of a man found in what looks like a crop circle. With everyone busy on cases, Ecklie must work on a case himself. Unfortunately, the body disappears from the morgue.
After Carter finds out Kem's mother is hospitalized in Paris he decides to go there to tell Kem how he feels about her. Meanwhile, Ray makes a fatal error.
Ash begins his third battle in the qualifying round of the Hoenn League Championships and knows he's up for a challenge. After getting three victorious in the qualifying round, Ash and his new friends ascend to the victory tournament. In his first victory tournament match, Ash goes up against a trainer famous for her keen strategy.
Seth and Zach squabble over who should take Summer to the prom and who will meet George Lucas for dinner; Sandy takes drastic actions with a recovering Kirsten; Ryan starts to piece together what happened between Trey and Marissa, courtesy of Theresa; Julie's attempts to poison Caleb take a surprise turn.
The new campus for Red Fountain opens. The Winx Club joins in the grand opening celebration and meet Helia, who likes drawing. But Lord Darkar attacks Red Fountain with a monster, hoping to distract Red Fountain from Icy, Darcy and Stormy, who are trying to steal the codex.
In season three's live finale, Donald Trump chooses his next Apprentice.
Clover is stuck babysitting Chucky, the obnoxious son of her Mom's best friend, on Halloween night, but luckily she's able to rope Sam and Alex into hanging out with her so it won't be such a drag. The girls take Chucky trick or treating in the eerie gated community he lives in but none of the neighbors seem to be home. They soon find out that a past villain who has a grudge against them has taken over the gated community and turned its inhabitants into ghouls bent on destroying the spies. Can the spies survive the monster attack and turn things back to normal before Chucky's mother gets home? In a b-story Jerry is going to his first ever Halloween party and keeps seeking the girls' advice on costumes.
The team examines the murder of an avid Boston Red Sox fan found dead with a ruptured spleen following a tough loss against New York. Danny must put his baseball skills to the test to piece together the evidence as the CSIs try to find out how and why he was murdered. Meanwhile, after testifying in a murder trial, Mac is confronted by the defendant, Quinn Sullivan, who questions the validity of the evidence. Mac is torn between trusting science or his desire to help a man facing jail time who swears he's innocent. Also, when a truck kills a barely clad woman early one morning, the team investigates why she was running through the streets and from whom.
When Fontana and Falco investigate an arson which caused the death of a firefighter, they discover a murder weapon tied to a nine year old murder and a hate crime in which the defendent attempts to have his case dismissed because he became a born again Christian after committing the murder.
The team captures the Sloane Imposter and questions him to find a rare Rambaldi orchid. The real Sloane must relive a painful memory in order to get the Imposter to reveal the orchid location.
Jackie is offered her dream job, but unfortunately, it's in Chicago. She wants to know what her future is with Hyde, but he's unwilling to answer. Kitty and Donna are both still reeling over Eric's new job, and both try, in their own ways, to get him to change his mind. The son of one of Red's buddies from the Marines arrives in Point Place, and the guys take a liking to him when they find out what his dad does now.
Joey asks Bobbie to help Sara find work. Sara gets a job working for Newsweek in Washington DC. Trying to get her to stay, Joey tells Sara he loves her and asks her to move in. Meanwhile, Michael's new girlfriend, a 45-year-old woman, cheats on him with a 60-something professor. Alex is struggling to keep herself together.
After asking Sara to move in with him, Joey freaks out. Sara freaks out too, and leaves without saying goodbye. Joey is heartbroken. On her first date in a long time, Alex accidentally offers sex to the guy, and Joey gets rid of him. While doing shots in Joey's bedroom and commiserating about the sad state of their love lives, Alex and Joey kiss! Meanwhile, Bobbie sets herself up with Michael at a Star Wars preview. When Gina confronts Bobbie about being attracted to Michael, Bobbie offers her a job.
Jack suspects foul play when Michael becomes violently ill while building the raft. The suspects include Sawyer and Kate, who compete for the last seat on the raft and do anything possible to prevent each other from getting it. Meanwhile, a secret from Kate's past is revealed to the other survivors on the island.
Clark must stop the school photographer after he sets up a fake high school and uses his ability to petrify people to kidnap students - including Chloe and Lana - to keep the glory days of high school going forever. Meanwhile, Lex and Lionel are kidnapped and tortured by the Teagues in an effort to find the Kryptonian artifact, revealing that...Lana has it.
In the shocking, action-packed season finale, a determined Veronica must betray someone she cares deeply about in order to solve the season-long mystery of who murdered her best friend Lilly Kane, but what she discovers puts her life in serious danger. Meanwhile, on the eve of a reception for the Governor of Calif., Jake Kane asks Duncan if he really wants to know what happened on the night Lilly died. Later, Keith awaits the results of a paternity test.
Rory is surprised by the performance review she receives from Logan's father. Luke's plan to buy the Twickham house is threatened by a competing bid.
House and his team tackle the case of a young man with a penchant for odd behavior, and House prepares for his date with Cameron.
With their residencies over, there are big changes at Sacred Heart. J.D. moves out to live on his own, while Turk and Carla consider a family change, creating another rift in their long friendship. Jordan is hired to handle some paperwork for Kelso, which annoys Cox. Elliot has a job interview at a different hospital thanks to her boyfriend Jake.
When Tony opens a mysterious letter thinking it's for him, a small puff of white powder comes out and it releases a possible deadly virus. Kate calls for help and soon she and Tony are isolated in a bio-hazard isolation room for precausion. McGee and Gibbs work to discover who sent the envelope and how to cure their friends before its too late for them. Meanwhile, Tony's health gets worse...