Doctor Who
Ko Sharmus
The Doctor, Ryan, and Ethan arrive on the planet and talk to Ko Sharmus who is guarding the Boundary in episode 12x09 “Ascension of the Cybermen”. The Master forces the Doctor to travel with him to Gallifrey and Ryan, Ethan, and Ko Sharmus are left behind to fight the Cybermen in episode 12x10 “The Timeless Children”.
Cliffs
Brendan is shot and falls off a cliff after chasing a criminal but manages to survive without a scratch in episode 12x09 “Ascension of the Cybermen”.