Date not given: An Enterprise shuttle seemingly causes the ignition of gases in an atmosphere, costing thousands of lives on the planet below. Admiral Forrest has no choice but to cancel the mission and call Enterprise back to Earth. Daniels, the time traveler from the 31st century, however, knows that the Suliban are responsible for the disaster by planting a device on the shuttle's hull. He sends Archer on a mission to track down a Suliban stealth cruiser, disable it and steal the evidence. But on the way back Enterprise is surrounded by Suliban vessels. In an attempt to correct history once again, Archer is transferred to the 31st century, but his absence triggers a development in which Earth is being devastated. Without any time travel equipment, Archer and Daniels are trapped in the 31st century, while Enterprise is facing a battle against a fleet of Suliban ships... Daniels and Archer find out that the Federation never existed in the current version of the 31st century, and that it must have to do with Archer's disappearance from the 22nd century. Searching for Archer, the Suliban have boarded Enterprise and confined the crew to their quarters. Archer and Daniels manage to send back a message through time to the Enterprise crew. Reed finds a time travel device in Daniels's former room, but Silik takes it, and Archer is returned from the 31st century to the Suliban Helix. In the meantime, having faked a warp core breach, Enterprise breaks free from the Helix. Archer manages to take Silik hostage and get back to Enterprise. The mission is allowed to continue.

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