Star Trek: Voyager Season 7 Episode 11

Stardate: Unknown. After Voyager passes near a spatial rift, Chakotay is injured in Engineering, leaving his body in a state of temporal flux. After receiving treatment in sickbay, he inadvertently gains the ability to pass through rifts in time that are scattered throughout the ship, enabling him to walk into different stages of Voyager’s history over the past seven years.