With Silurians and Sea Devils attacking the air locks, the saboteurs use the distraction to launch plans for disabling vital functions of the base. With all the strife going on around him, and an electricity-generating myrka on the loose, the Doctor endeavors to bring a little sunshine into their unhappy undersea lives. Written by
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The myrka is a creature of the inkiest depths - or WAS until the Silurians tinkered with its biology. Anyway, it has little tolerance to light and hopefully none at all to ultraviolet rays.
Can you be sure?
No, Tegan. Perhaps you should ask it nicely to go away?
Featured in Room 101: Episode #7.7