A time corridor, called Timelash, has been set up to punish dissidents on the planet Karfel, dumping them alive but permanently into Earth's early history. The TARDIS runs right into it, and the Doctor thereafter finds a society with advanced technology it shouldn't have along with an unnerving absence of reflective surfaces of any kind. Written by
Did You Know?
This episode overran by six minutes. Pennant Roberts
suggested simply shifting the cliffhanger back to the Guardoliers' attack on the rebels, inserting reaction shots to imply that Peri had been killed instead of Katz. However, John Nathan-Turner
rejected this notion. it was decided to move some of the material involving Peri being taken to the Morlox cave ahead to episode two. See more
Have you been traveling long?
Oh, well, it's hard to say, really. Time just FLIES when you're in the TARDIS.