A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
After a federal witness is killed, the US attorney arrives at the Lightman Group to take the next witness in line, Reynolds, into protected custody. Cal feels that the US Marshals Service cannot protect Reynolds, so he takes him "hostage" and demands that he be able to run the investigation into the witness's death. During his investigation, he finds out that while undercover Reynolds did drugs and killed a man and wants to keep it a secret to avoid prosecution after he finds out that his handler (Alicia Coppola) did not properly report the event. Through his own undercover operation, Cal records the handler admitting that she led Reynolds to believe that everything was all set legally, and the US attorney subsequently takes her into custody. Meanwhile Loker and Torres discover that the original witness was killed after the cell phone that his mistress provided was tracked to his safe house's location.
Claire is determined to get to the bottom of the Sorority Rush attacks on her own, until H.R.G. intervenes only to realize he may be the source of her troubles. Meanwhile, Peter's new ability is a perfect fit for his job and gives him the opportunity to help Emma accept her new life. Elsewhere, Sylar's battle at gaining full control over Matt's body escalates with potentially dangerous implications at stake.
Horatio Caine calls Las Vegas CSI Ray Langston to come to Miami when a severed leg found in the Everglades is discovered to belong to a girl who went missing in Las Vegas a week earlier. The crossover continues on CSI:NY S06E07 Hammer Down (II) and CSI: Crime Scene Investigation S10E07 The Lost Girls (III).
Lizzie finds herself in trouble after an incident at school, and Cassie's art may take her back to New York City for college.
Charles' career plans worry Cassie when he talks about joining the military, and Lizzie's budding thespian career may be cut short when the school musical is canceled.
Erza asks Gray and Natsu to form a team with her to stop a corrupt guild from using a dark magic that has the power to sap the lives of everyone in Fiore!
Buddy, Tiny, Shiny and Don meet Perry Parasaurolophus, a dinosaur with a crest on his head who teaches them a new way to hoot some hip music.
Shiny, Tiny and Don throw a surprise party for Buddy on the Dinosaur Train and invite a whole caboose full of his friends!
Eight Canadians with poor driving skills are sent to an army base. They undergo challenges to enhance their driving abilities. Weekly, the most improved driver leaves. The last remaining participant is deemed Canada's Worst Driver.
Miranda gets overexcited by the prospect of her first real date and decides it's time to try to be more girly, but her makeover doesn't go quite to plan.
General Buddy and his team of cake soldiers really want to impress their client this week when they create a massive cake for the US Air Force. The guys get their groove on while making a dance-themed cake and the girls get into a catfight.
Buddy's got a real loudmouth in the bakery this week but it's not a customer, it's a talking cake! Then, when Buddy is tasked with a cage fighting cake, his teenage nephew is inspired to challenge Frankie to a wrestling match.
Having picked up the gauntlet thrown down by Richard – and having thwarted a blackmail bid aimed at getting Jonathan to take a dive – the Edition team gear up for a tripleheader boxing challenge against their GQ rivals. But with the bouts only hours away, the women in their lives offer some compelling reasons why winning isn’t everything.
Henchman 21 kidnaps the Venture brothers without The Monarch's knowledge or consent, resulting in Sgt. Hatred having to storm his former hometown of Malice to rescue his charges. We also learn of the recent activities of 21 since the death of 24.
Dexter finally strikes a balance between family, career and his secret life, but is thwarted in his pursuit of his next victim, while Debra expresses a renewed and unwelcome interest in their father's checkered past. Miami Metro Homicide tries to solve the Model Killer Case.
Hank's attempts to set things right with Karen lead to even deeper entanglements with the campus ladies. In the meantime, Charlie tries to prevent Sue's top client from leaving the agency and Becca scolds Hank for being a terrible role model for her.
An investigation into a deadly case of mistaken identity reveals a secret love triangle and an underworld web of intrigue.