Paris, Tuvok, and The Doctor are stranded on a hostile planet within a gravity well that has a significant time differential.
5-11: Latent Image
The Doctor notices that a large portion of his memories have been deleted, after experiencing emotional instability from a decision that lead to a crew member’s death.
5-07: Infinite Regress
A Borg vinculum stirs up the memories of every victim Seven of Nine helped to assimilate, leaving her to exhibit multiple personality disorder.
Seven’s Borg nanaprobes meld with The Doctor’s mobile emitter, creating a new drone based on 29th century technology.