WTTW split the story into two episodes, with the break occuring during episode four when the Doctor points out to Hart that the submarine signal is heading towards the beach near the prison. [source: ChicagoEpguides]

Intro: The Sea Devils ruled the Earth a million years ago and now they want it back. They have a powerful ally in The Master. This is indeed a serious situation. So serious it will take two weeks to resolve, so let's two it.

Outro: Next week, The Master meets our clever, reptilian submariners. Whatever will they say to each other? One needn't conjecture, one need only tune in next Sunday evening at 11 for the conclusion of "The Sea Devils." [source: ChicagoEpguides]