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, summoned by The Master, meet him and forge an agreement. The Doctor, in an attempt to sunder this unholy alliance, must descend to the floor of the sea. Will his effort succeed? We will know in the fullness of time as we view the conclusion of "The Sea Devils."

Outro: Next week, the Time Lords send The Doctor and Jo to the planet Solos to deliver a mysterious message to an unknown party. They will meet The Marshall and discover his horrifying hobby. You will learn more when the tale of "The Mutants" unfolds, next Sunday evening at 11. [source: ChicagoEpguides]

Episode one was skipped owing to it being black and white.