Captain Janeway and Seven of Nine seek to undermine the Borg Queen's authority when a dream fantasy spawned by the drones threatens the Collective.

Susanna Thompson (The Borg Queen)
Mark Deakins (Axum)
Jerome Butler (Korok)
Joanna Heimbold (Laura)
Tony Sears (Borg Drone)
Ryan Sparks (Alien Child)

• Unimatrix Zero is the dream state that some drones enter while regenerating. One out of every million drones is able to dream. When in this dream state, the drones appear "normal" and can function as individuals.
  
• Tom is given back his rank of Lieutenant Juinor Grade. His rank was reduced to Ensign in the 5th season episode "Thirty Days".