Given the fact that many Voyager characters have made their return in either the form of holograms or, in the case of Tom Paris, a commemorative plate on Lower Decks, it seems like the Doctor would be an ideal character to show up on a modern Trek series. After all, the Doctor doesn’t die or age (a point used to great effect on several Voyager eps) and even if actor Robert Picardo is visibly older than the last time he played the role, producers managed to work around Brent Spiner’s aging for his return as Data. To be sure, Picardo likes the idea of following his castmates back to the screen. But he has different ideas about how to do it. “It’s certainly something I’m open to and the character lives on inside me,” Picardo said during an interview on To Boldly Ask. However, the character that lives inside Picardo may not be the Doctor. In fact, he talks about not necessarily returning as the Doctor, but rather Doctor Zimmerman, the scientist who created Emergency Medical Holograms and modeled the first batch after himself. “I could easily play Doc Zimmerman again because Zimmerman is in the same timeline as certain of those Star Trek series,” he pointed out. Not only would playing Zimmerman allow Picardo to literally act his age, but it also makes more sense storywise. Zimmerman interacted with characters in the Alpha Quadrant while the Doctor and Voyager were in the Delta Quad, but Starfleet quickly moved past Zimmerman. Rios’s ship on Picard has an EMH modeled on himself, and even during Voyager, we saw a later EMH with a non-Zimmerman model (given the fact that this EMH was played by Andy Dick, I’m not sure it was an improvement).