Re: 7X11 The Crimson Horror(Grading/Discussion)(SPOILERS
It wasn't. Nor did it feature scarlet alien leeches.
But it did have a sociopath creating a group of 'perfect' people to repopulate the earth after dropping poison on it from a great height. And a damned near identical "rocket launch" scene with the good guys in the launch bay when the rocket goes up.
Pah! That's nothing like this episode.
One more anal-probing gyro-pyro levitating ecoplasm alien anti-matter story and I'm going to take out my gun and shoot somebody.