The Invaders - Season 2 - Eps 19: The Pit
Julian Reed calls upon David Vincent to help him expose aliens who have infiltrated The Slaten Research Center. By the time David arrives at the scene, Julian's having hallucinations. Is Julian truly a lunatic, or are the aliens behind his mental lapse?
About The Invaders

Title: The Invaders
First Air Date: 1967-01-10
Last Air Date: 1968-03-26
Status: Ended
Rating: 6.8/10 (from 58 votes)
Language: EN
Seasons: 3
Total Episodes: 43
Network: ABC
Genres: Action & Adventure, Sci-Fi & Fantasy, Drama
Production Companies: Quinn Martin Productions (QM)
Synopsis
The Invaders, alien beings from a dying planet. Their destination: the Earth. Their purpose: to make it their world. David Vincent has seen them, for him it began one lost night on a lonely country road, looking for a shortcut that he never found. It began with a closed deserted diner, and a man too long without sleep to continue his journey. It began with the landing of a craft from another galaxy. Now, David Vincent knows that the Invaders are here, that they have taken human form. Somehow he must convince a disbelieving world that the nightmare has already begun.
Cast

Roy Thinnes
David Vincent