The U.S.S. Voyager discovers that Species 8472 has created a habitat simulation of Starfleet's San Francisco Yards, and are training their own to pose as humans to eventually invade Earth.

Ray Walston (Boothby)
Kate Vernon (Cmdr. Valerie Archer)
Zach Galligan (Ensign David Gentry)
Tucker Smallwood (Admiral Bullock)

• Chakotay poses as "Commander Jason Hayek" from the U.S.S. Intrepid, patrolling the Neutral Zone.
  
• Chakotay's Starfleet service number is 47A612.
  
• Ensign Gentry's Starfleet service number is 99B3278.
  
• This habitat is Terrasphere 8, Starfleet Command re-creation, one of a dozen in the quadrant. The habitat uses thermionic generators as its power source.
  
• Starfleet Headquarter's Officer's Club is called the "Quantum Cafe."
  
• The last time Janeway was at Starfleet HQ was when she was given general orders for Voyager's first mission: "Proceed to the Badlands. Find the Maquis."
  
• The last time Chakotay was at Starfleet HQ was on March 3, 2368, when he gave his resignation to Admiral Nimembeh, who taught Tactical Analysis at the Academy.
  
• Writer Nick Sagan is Carl Sagan's son.