As the annual Snowflake Ball approaches, Blair and Chuck make a bet that they can find the perfect date for one another. Aaron's ex-girlfriend, Lexi, becomes attracted to Dan, creating mixed feelings for Serena.

The team has to face Casey's former sensei.

Cameron's secret is exposed. A Terminator sent to the wrong time causes catastrophic results changing history.

Phyllo dough can be finicky but host Alton Brown tames this difficult pastry to create that wonderfully layered dessert known as baklava.

The eclipse continues to create chaos. Sylar and Elle face HRG's wrath. Peter, Nathan and the Haitian go up against Baron Samedi. Ando and Frack try to help Hiro with his memory loss.

It's up to Michael to hold the gang together after they find out they were betrayed by one of their own. Meanwhile, Gretchen is blackmailed by T-Bag's new partner.

A Russian man is found frozen in a railway car. He turns out to be a former KGB agent with Russian mob connections. As ICS investigates, they travel from the high arctic, where African blood diamonds are being "laundered"? by Canadian mines, to an upscale New York City penthouse, where Layla encounters an old flame.

Megan decides to punish Rose for planning to cheat on her final by grounding her. Meanwhile, Laurel rekindles an old flame, Charlie has doubts about living with Mandy, and Marco gets a new partner in the kitchen.

Sam tries to make herself appear to be an environmentalist, so Owen might like her more. Andrea doesn't fare well when the basketball player, Tony Dane, is looking for a date.

After the breakup between Owen and Sam, The Newlys, Dena, and Andrea decide to pack it up and head out for an overdue family vacation to a lodge. Sam is met by an unexpected friend at the lodge, Brad, who was her childhood sweetheart. Things get turbulent when Andrea makes a pass at him.

Alan pleads before the Massachusetts Supreme Court to allow his best friend Denny (who learns some disturbing news about the progression of his Alzheimer disease) have access to an experimental drug which could slow the progression of his Alzheimer's disease is available but not FDA approved.
Meanwhile, Jerry and Katie take on a case of a woman who used a brain-enhancing drug while taking her SATs and was disqualified from Harvard. The murderous Catherine Piper returns.

The Pratts try to be a family for once and Audrina hopes Lauren would talk to her again.

Edward commits treason, when asking about his parent's death. Raymond tries to reason with Tom and Mary to avoid any potential accidents.

Actress Anne Hathaway

Tonight Stephen welcomes Harvard economics professor Roland Fryer.

Zommari, upset over Byakuya refusing to consider him an equal opponent, releases his zanpakuto, Brujeria, causing him to grow eyes all over his body that can control anything. He attempts to hinder Byakuya by controlling his left leg and arm, but Byakuya, realizing what is going on, severs the tendons and renders them useless. Hanatarou arrives and tries to get Rukia to safety, but Zommari uses his ability to control Rukia, who severely wounds Hanatarou, and demands that Byakuya surrender under the threat of making Rukia kill herself. Byakuya immobilizes Rukia with kido, and uses his bankai to attack Zommari, who is unable to control the countless blades to save himself.

Joseph's worried if anyone knows he spent the night with Jac - will they say anything to Faye? Elsewhere, Kyla gets ready to hand her notice in. Donna, meanwhile, drops a bombshell on Maria and Sam has a meeting that could change his life...

Abby comes across a viable community led by Samantha Willis, the former junior health minister and the last surviving member of the government. Greg and Tom, searching for supplies, discover a family that has survived by remaining in isolation during the outbreak.

Brian Cox examines the history of time and visits the ancient Mayan pyramids in Mexico where the Maya built temples to time.