6. In the original series, the Doctor was known by the name Doctor Zimmerman and had many personalities. The crew members couldn’t certainly say which one they’d encounter when they activated the Doctor.
7. When the holographic Doctor shows up, the stage headings in the script say that he “Zimmers in.” Furthermore, when he deactivates, he “Zimmers out.”
8. Proficient wrestler and actor Dwayne “The Rock” Johnson showed up in the episode “Tsunkatse” as a savage gladiator who fought Seven of Nine.