Financial problems may force Crane, Poole & Schmidt to be put up for sale. Meanwhile, Alan petitions the Supreme Court for Denny's access to a non-FDA approved medicine; and Shirley and Carl plan their wedding.
Leonard asks Penny for advice when his new relationship starts moving too fast.
Mel tries to prove she doesn't need help from Angela when she considers renting the apartment above Sam and Mel, to be closer when the baby comes.
As we descend beneath our modern day cities, we are met with ancient and hidden secrets. Journey with us back through history and rediscover cities of the underworld.
In order to stop Arthur, Hiro and Clair team up and travel back in time to when Kaito gave Claire to H.R.G. Meanwhile, Peter and the Haitian head out to stop Arthur, but are stopped by Sylar and Suresh has a breakthrough with the formula.
The Chief tries to help a boy who has aged rapidly. Meanwhile, Blake tries to help people via the healing power of laughter.
When Cat breaks up with Owen, Lola decides to be supportive and break up with her own boyfriend, Glenn, by telling him that she has brain cancer.
Things get tense after Cat sneezed on Lola. Meanwhile, Briggs tries to get Glen back on the police force.
Another doctor tries to use Blake's method: the healing power of laughter.
The Chief calls a staff meeting to discuss Lola's nonexistent brain tumor.
When Jeff and Carolyn decided to buy their first house together, it was a big deal for the self described procrastinator and his long-time girlfriend. When a small character home caught Jeff's eye, she knew they had to move fast. Excited about making their new house a home, they made big plans to overhaul the entire house. But eight years later, they've still got some major issues. To help this conflicted couple are designer Jillian and realtor Todd. Jillian and her team will try to turn this '30s bungalow into a comfortable new living and entertaining space, while Todd tries to sell them a new home that suits an active life style. Stuck with a tiny house that is sabotaging their social life, Carolyn and Jeff will have to decide: will they love their home again or will they list it?
In NYC, Whitney has an interview with Diane von Furstenberg and sees Jay. Plus, Lauren says goodbye to her Laguna home and Stephanie makes a difficult decision about Cameron.
The gang members are thrown in jail after the police find evidence linking them to the Baron's murder, and rumors begin to spread of a traitor in their midst. However, they soon face a more immediate problem when they are confronted by a vengeful inmate.
Luke's dreams are being tormented by visions of Mrs. Wormwood. The Sontarans are back for revenge. Sarah Jane must once agian call on an old friend.
Horatio delves into Delko's past to find the killer who targets the motel Delko is staying at.
With the Russians launching a nuclear strike on London, the only person who can help the team in this desperate hour is the traitor amongst them. With the Russians hunting them down, the team ushers their traitor through London in a desperate bid to reach the codes, and the bomb, in time.
Tommy's plan to extricate himself from political entanglements hits a snag when Speaker Danatello seeks his help passing the budget. Declan learns more about Tommy's involvement in the Waterfront Project and connects Tommy to Nozzoli. Michael's jealousy over his mother's attachment to Colin adds fuel to his paranoia about Colin and Kath.
Alex tries to save the taxi that she was born in. Meanwhile, Justin sets out to find his birthplace.
A body is found at a cash point, the apparent victim of a heart attack. Two teenage girls are arrested for the brutal murder of a cab driver. The girls confess to the crime, showing no remorse. Two open and shut cases. At first these two incidents seem to have nothing in common, but as Wallander delves deeper into the mystery of why the girls murdered the cab driver, he begins to unravel a plot much more involved complicated than he initially suspected. The two cases become one, and lead to a conspiracy that stretches beyond the borders of Sweden.