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See broadcasts for WQEDThe Keys of Marinus: The Snows of Terror

Last updated 02 January 2017
The Keys of Marinus: The Snows of Terror
Broadcast: Saturday 17th April 1999
11:30pm-12:00am EDT (03:30 GMT) < > « »
Featuring: William Hartnell, Carole Ann Ford, Jacqueline Hill, William Russell, Robin Phillips

In a snowy wasteland, Vasor, an unscrupulous trapper, imprisons the travellers in a frozen cavern inside a mountain. There they find one of the keys frozen in a block of ice.

Synopsis Source: Doctor Who Guide

Actually broadcast a little earlier as immediately followed the previous episode with no gap between.
Broadcast Source: TWIDW

Report from the This Week in Doctor Who Archive:

Friday 16th April 1999:
WQED / WQEX 13, 16 Pittsburgh, PA
Saturday at 11PM EDT The Pyramids Of Mars episode 4 of 4
Immediately Afterwards - The Keys of Marinus: The Snows of Terror episode 4 of 6

In "Pyramids", Sutekh escapes his prison, but not before the 4th Doctor gets an idea. Then flip back to the very first season. Ian and Barbara search for Sabetha, Altos, Susan, and the 3rd key of Marinus in a region of frozen tundra. Their only hope is a hunter / trapper, who is slightly less trustworthy than a Dalek.