When an Arctic explorer is killed during a polar expedition, the mysterious circumstances of his death take Castle and Beckett from the penthouses of Park Avenue to the halls of the CIA. But Castle’s delight at the case’s many twists and turns soon turns to frustration as he realizes that their elusive killer might just be fooling them all.
Marshall and Lily want to hook up with Barney and Robin for double-dating and fun, but their desperate eagerness to please is a huge turn-off. Meanwhile, when a succession of girls come to his apartment and immediately fall asleep, Ted is bummed to learn he is a “Sexless Innkeeper” whose “dates” are only interested in a comfy place to crash
Samuel prepares for new additions to his family, while Lydia warns him of the consequences. Claire discovers that her roommate Gretchen may have a hidden agenda. Meanwhile, Peter finds an unexpected way to connect with Emma, who would prefer to stay distant. Elsewhere, a different side of Sylar emerges as he desperately tries to remember the person he used to be.
A man from the American Embassy in Mexico asks Cal to “unofficially” investigate the disappearance of an American woman after local police refuse to look into it. Meanwhile, Cal’s rival, Jack Rader, works with Gillian to identify the person responsible for tainting the blood bank supply when several patients become seriously ill, and one dies.
Echo and Victor’s imprints collide when Echo is sent on an assignment as a fun-loving, seductive college student and Victor is imprinted as the psychotic nephew of a Dollhouse shareholder.
With the air supply failing on the Destiny, a team disembarks to a desert-like planet in search of the mineral needed to scrub the ship’s air of carbon dioxide. After testing numerous sand samples without success, and with their window of opportunity closing fast, the group opts to split into two to cover more ground, despite the unbearable heat.
Jane, Cho, Rigsby and Van Pelt decide to conduct their own investigation when Lisbon is accused of murdering a child molester she arrested who was recently paroled.
Annie recruits Abed and Troy as psychology test subjects. Shirley and Jeff bond as they gossip about Britta and her boyfriend.
Recuperating from the traumatic and alarming meeting with Massive Dynamic founder William Bell, Agent Dunham consumes a powerful “fringe” concoction that Dr. Bishop prescribes to stimulate her memory. Meanwhile, the Fringe Division investigates a series of robbery cases that are tied to shape-shifting. As clues are tracked and memories are jogged, another woman experimented on by Dr. Bishop is introduced and a flashback reveals more about Olivia’s visit to the alternate reality.
Phil pushes Jay to go out with him and fly his new model plane. While Manny takes time out to play with Luke, Gloria accompanies Alex in shopping for a dress. Manny has a heart-to-heart talk with his sister Claire.