Stardate 52143.6: 15 years in the future, Harry Kim and Chakotay are the only survivors of USS Voyager. They find the ship buried in ice, salvage the Doctor's mobile emitter and Seven of Nine's body and take them to the Delta Flyer where an assistant named Tessa is waiting for them. The two are eager to change history. 15 years ago, a quantum slipstream drive was installed on Voyager. When Tom and Harry found a flaw in the design, Harry and Chakotay took the Delta Flyer to guide the ship through the slipstream by transmitting corrections to the phase variance. But Harry made an error, which caused Voyager to drop off uncontrollably and crash on an ice planet with no survivors. With the help of a stolen Borg temporal transmitter, Harry and the Doctor prepare to send a message back in time to Seven's cranial implant, containing corrected phase data. But the attempt fails. Although Seven receives the corrected data, the disaster happens anyway. Moreover, the USS Challenger under Captain Geordi La Forge is on their heels. The Delta Flyer takes damage, and the warp core is about to breach. Harry has no time to try out still other phase variances, and on the Doctor's advice he sends data that would collapse the slipstream field, thereby preventing the accident but also putting an end to this experimental drive on Voyager.

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