Castle and Beckett get an inside look at the cutthroat world of the New York fashion industry when they investigate the brutal murder of a young model during Fashion Week.

When Robin fears that Barney is cheating on her, she soon discovers that he is spending his evenings with Ted learning everything there is to know on how to date her.

As « Nathan » starts displaying new powers, he has visions of an incident from his past involving a young girl and decides to investigate. Hiro tries to save a co-worker and learns a truth about himself. Tracy tries to regain her old life and job.

Zoe enlists Cal and Ria to help prove that her client, a 22-year old college boy charged with statutory rape, had no idea the girl was only 16. Meanwhile, the IRS believes a group claiming to be a religion is a fraud and hires Gillian and Eli to investigate.

Echo is imprinted with the personality of a mother with a newborn baby. Complications arise when, thanks to Topher’s programming, Echo takes too strongly to motherhood. Perrin ramps up his investigation into Rossum and DeWitt pays November a visit.

When Icarus Base is attacked, it’s inhabitants are forced to flee through the Stargate. The base was created on a distant planet to take advantage of a powerful energy supply located there. Their goal is to try and determine the purpose of the mysterious ninth symbol of the Stargate which they have never been able to lock in. In going through the Stargate, they are transported not to Earth but onto an very old, apparently uninhabited but huge spacecraft. With the group’s commander injured, Lt. Scott and the chief scientist, Dr. Nicholas Rush lead the exploration of the craft. Several areas of the ship have been damaged but it is basically functional. They are able to learn that they are in fact billions of light years from Earth.

The survivors arrive on an uninhabited ship floating billions of light years away from Earth. Panic spreads throughout the group and Col. Young, who was severely injured during the escape, transfers command to Lt. Matthew Scott, before lapsing into unconsciousness. Teams led by Dr. Rush and Sgt. Greer try to make sense of the situation, while Lt. Tamara Johansen, a medic who was days away from leaving the program, is thrust into the role of chief medical officer.

Lisbon and the team work the case of a State Senator’s murdered intern, while Jane simultaneously tries to find out what new information Bosco has uncovered on the Red John case.

Jeff joins Professor Whitman class for an easy A grade but then realizes how much work he needs to put in to pass. Britta helps Abed fulfill his dream.

Peter, Walter, Olivia and Broyles pursue a strange and deadly occurrence in Philadelphia where a bomb blew up inside a train station but left no trace of any explosive device. The perplexing and unexplained set of circumstances returns Walter to the lab to closely examine the human remains where he uncovers an unlikely energy source that triggered the explosion. With the explosive threat of more bombs and links to a classified military project, the intense investigation leads Olivia and Peter to Iraq.