"Revive the warriors!" The TARDIS materialises inside Sea Base Four, which lies on one of Earth's ocean beds in the year 2184. The Doctor, Tegan, and Turlough quickly run into trouble, as the base's personnel suspect them of belonging to an enemy power bloc.
Nearby, a group of Silurian reptiles - who inhabited Earth centuries before mankind - are reviving some of their Sea Devil cousins after an overlong hibernation. The intention of these combined forces is to attack Sea Base Four and provoke a war between the rival human governments.
The narration is louder than the acting and sound effects, so everytime you really start getting into the story, the narration takes you back out. Really wish they had used sound effects to convey what you couldn't see as in other dramatizations rather than a loud narrator.
This is NOT narrated by Peter Davison. They use the sound track from the TV show, with his voice, but Janet Fielding is the narrator. I was very disappointed to find that out the hard way (I guess I didn't read close enough.