Stardate not given: Sisko receives two unpleasant visitors: Dulmer and Lucsly from Starfleet's Temporal Investigation. They question him about a recent time travel. Flashback: The Defiant is carrying the Bajoran Orb of Time when Arne Darvin, an old Klingon disguised as a human, uses the device to send the ship more than 100 years to the past. More precisely to the time when the USS Enterprise NCC-1701 was orbiting Deep Space K-7, summoned there to protect a cargo of quadrotriticale. Arne Darvin was present aboard the station and was later, with the help of Tribbles who don't like Klingons, exposed as a Klingon spy who had poisoned the grain. Now he strives to alter history. He has planted a bomb on the station to take revenge on James T. Kirk. The Defiant officers are deployed to find the bomb. Sisko and Dax manage to find it attached to one of the Tribbles in the grain storage just above Kirk's head. The bomb is beamed into space and the original timeline is preserved. The Defiant, however, brought some uninvited guests to the 24th century, as Deep Space 9 is swarming with Tribbles.

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