There's a serial killer on the loose marking all of his victims with a Y on their chests and one or more of the csi's lives are in danger in this season 5 finale
Goren and Eames find a scrapbook belonging to a serial killer on death row. It suggests that he may have had more victims than previously known.
Tommy and Jimmy have two different ideas on how to save the Donnellys. Tommy hatches a plan to get the family, along with Jenny and Joanie, out of town.
It's still Marshall and Lily's big wedding day but now we're at the reception. Robin tries to tell a story but keeps getting interrupted. Barney tries his hardest to figure out Ted and Robin's secret.
Poised to become a member of Congress and maybe more, Nathan considers the cost to those he loves, along with his mother's advice and Linderman's prophecy. As he prepares to face Sylar to the death, Hiro learns of his lineage from his father. While various "heroes" fatefully arrive in New York City, Peter and Claire attempt to leave the city before the foretold explosion. H.R.G.
Russia presses the White House, while Jack must try to thwart the Chinese and his oldest antagonist simultaneously.
Evelyn's boyfriend, Teddy, invites Alan and Charlie to go with him to Las Vegas on his private jet. The boys confront their individual 'daddy issues'
Alex's double life is finally bringing in the cash she wants but hiding everything from everyone is taking a toll on her schoolwork and her connection with Paige. But making money is the only way she and her mother won't get evicted - Alex tries to convince herself she's making the right decision. When Sean and Emma are not talking, she will have to go through her scariest experience yet all by herself. Marco also learns that sometimes love is very, very messy.
When Brian's dog finds a body, it prompts two people to confess to murder. It turns out that the body is over 600 years old, so Sandra, Jack, Brian and Gerry must discover why the pair took responsibility for a crime they couldn't possibly have committed and if they are the perpetrators of other killings. Elsewhere, Strickland is rather keen for them to solve an even more tricky mystery that is closer to home.
Doug and Carrie's marital tension continues, as they ponder whether they have a future together. Arthur and Ava's wedding day turns problematic.
At Arthur's wedding reception, Doug and Carrie's marital tension continues, and they ponder whether they have a future together.
The Warden requests the inmates wear bunny costumes as uniforms, but the Twins order some wolf costumes as well and make all Hell breaks lose when they start acting like the animals they are dressed as.
Eric and Vince are determined to get "Medellin" off the ground, but the rights to the script stand in their way. Feeling tense the day of the "Five Towns" premiere, Drama seeks relief at a massage parlor, but can't avoid Daily Variety. At the auto-body shop, Turtle meets a girl who shares his love for limited-edition sneakers, but her overbearing father hampers his game.
Nancy turns to her mother for help when the stress of home life and unresolved feelings for Redcorn cause her hair to fall out.
Kevin acts as McCallister's attorney when a radio host makes accusations against his war heroism. Also, Tommy and Julia must face a tough decision regarding their newborn babies.
A girl's parents retain Peter to sue Cambridge University because she has not been offered a place. Peter visits his old tutor to investigate and learns that Simon contacted him for money shortly before he disappeared. Gloria is upset because it is a year since her husband died, and her son is picked up by the police for breaking windows in the town. Lyle assists Snell in a scheme to stop the gas company building on a piece of local grazing land. Beatrice uses Lyle to win back Alan, but on discovering that Alan has again been cheating on his sister Peter confronts him.
The Colonel sends Eric and Annie a gift--an RV--prompting Eric to talk Annie into taking the family on a trip to see America, and the list of traveling companions grows by the minute. In the middle of the happy madness, Lucy and Kevin make an announcement.
On a mission to find Jacob and his crew, the boys leave the relative safety of the trailer park for a dangerous adventure in the woods on the Maine border.