Red Sea

Red Sea is the eighth episode of the tenth season of Doctor Who, and is the second part of the Sea Devil story arc, which began in Vengeance From The Deep. It also sees the return of UNIT, seen last in previous season.

Synopsis
"Once more this earth shall be ours, and we will rule it as we did before you wretched apes!" - Kroix, leader of the Sea Devils

The earth stands at the mercy of its former masters, with the Doctor caught in a battle between mankind and the Sea Devils. When the UN threatens to nuke London, the Doctor must find a way to save England, and the whole of the earth, from the Sea Devils.