With intel from the Ark, Bellamy and Clarke go in search of supplies to help the group survive the coming winter — unaware of an assassin on their tail. Octavia makes a personal connection with the prisoner, and the camp is affected by a nut with hallucinogenic properties.

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From The CW:

TERRY CHEN ("HOUSE OF CARDS") GUEST STARS IN THIS EPISODE - Clarke (Eliza Taylor) and Bellamy (Bob Morley) go on a mission to find supplies for approaching winter. Some of the 100 accidentally eat nuts with powerfully hallucinogenic properties and lose their grasp on reality. Meanwhile, Octavia (Marie Avgeropoulos) seizes the opportunity to help a friend escape, and a terrifying event brings Clarke and Bellamy closer. On the Ark, Commander Shumway (guest star Terry Chen "House of Cards") secretly assigns one of the 100 to kill one of his own, and the treacherous actions of Diane Sydney (Kate Vernon ("Battlestar Galactica") are revealed.