Astounding consequences occur when Voyager, while attempting to evade pursuing Vidiian vessels, enters a plasma cloud. Before they can clear it, the engines stall, anti-matter supplies drain and proton bursts, originating from within the ship, cause heavy casualties and breach the structural integrity of the hull. When Ensign Kim and Kes disappear into a void in space, Captain Janeway discovers a duplicate Voyager with an identical crew exists in a parallel universe. While the crew feverishly attempts to contain the worst onboard disaster ever, the Doctor struggles to keep alive Ensign Wildman's newborn, half-human, half-Ktarian baby. Then Janeway discovers that although a divergence field has caused all sensor readings to double and every particle on the ship to duplicate, there is not enough antimatter to sustain both vessels. As the Vidiians close in on them, she meets the other Janeway face-to-face to determine a solution, knowing only one of the two ships can survive.

Nancy Hower (Ensign Samantha Wildman)
Simon Billig (Lieutenant Hogan)
Bob Clendenin (Vidiian Surgeon)
Ray Proscia (Vidiian Commander)
Keythe Farley (Vidiian)
Christopher Johnston (Vidiian)

• Ensign Kim and Ensign Wildman's baby (later named Naomi) are killed, and are replaced from the alternate Voyager.