The Invaders/The Pit
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The Pit is the nineteenth episode of the second season of The Invaders, and the thirty-sixth episode overall.
and Special Guest Star: Charles Aidman (Professor Julian Reed)
A brilliant scientist who's a member of Vincent's Believers has a mental breakdown and is placed in an asylum. David believes that a 'dream machine' may have a role in his friend's condition, and that the aliens have taken over a science project.