Star Trek: 10 Secrets About The USS Protostar You Need To Know
9. Hollow, Holo?
How can the Protostar be discussed without even a single mention of the Kathryn Janeway training hologram?
Modelled after the captain during her time aboard Voyager, it would be only the second time viewers saw a Federation starship equipped with holoemitters across its decks to allow for such projections.
The first time was back in Voyager's Message in a Bottle when the EMH and EMH2 countered a Romulan takeover of the prototype USS Prometheus. Earlier in Voyager they had been mentioned in the imagined realities of Projections and Cristobal Rios had a wealth of them installed aboard La Sirena in Picard.
Holodecks were also expanded thanks to the Hirogen for their obsession with the Hunt in The Killing Game. Holoprojectors throughout the ship have also been utilised more recently in Lower Decks' A Few Badgeys More to realise the return of that show's breakout holographic star (or delta).
It's also very unusual since this meant that Kate Mulgrew would continuously voice two versions of the character for the majority of the series as both the ship hologram and also as the "real world" Admiral Janeway aboard the USS Dauntless.
Of course, Janeway was not the only legacy character to return in holographic form as viewers saw in Kobayashi.