Mindwalk

The Protostar heads for Federation space with the Dauntless close behind. Dal use his nascent telepathic ability to warn Admiral Janeway about the construct, but accidentally swaps bodies with her. Janeway, in Dal's body, learns the story of the Protostar young crew, repairs Hologram Janeway, and vows to help the team, though she notes that Dal cannot join Starfleet because Augments are outlawed. On the Dauntless, Dal's attempts to pass as the admiral arouse suspicion. Janeway and Dal are able to swap back by touching hands during a spacewalk between the two ships, and Dal returns to the Protostar. The ship leaves warp to face a Federation armada.

Summary from Wikipedia, CC BY-SA 4.0.