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As Claire becomes immersed into the world of the Carnival, she becomes increasingly suspicious of Samuel's motives. Hiro is on a mission to rescue one of his own, but has difficulty communicating his intentions to Ando.
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"Pass/Fail" is the fifteenth episode of the fourth season of the NBC science fiction drama series Heroes, and the seventy-fourth episode overall. The episode aired on January 18, 2010.
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