Ncuti Gatwa is the Fifteenth Doctor, and Millie Gibson is his companion, Ruby Sunday, in the first Doctor Who season helmed by Russell T. Davies since 2010.
It will fail to leap to Season 3.
Shepherd teased that she'd "been waiting years to ask" the Ghostbusters star to do that.
The show's sophomore season just aired its finale on Tuesday.
Mallori Johnson and Micah Stock star in this adaptation of Octavia Butler's 1979 novel.
What's next after that cliffhanger tying back to the original series?
"Theorizing that one could time travel within his own lifetime, Doctor Sam Beckett stepped into the Quantum Leap accelerator and vanished..."
Raymond Lee stars as Dr. Sam Park, who goes rogue and tries to continue the time travel research of Sam Beckett.
Get a look inside the revival of the classic time-travelling series with EP Martin Gero and star Raymond Lee.