Producer: Leslie Stevens

Marshall: George McReady
Konig: Leonard Nimoy

Testing his new invention scientist Marshall and his crew work with subatomic particles. The work cannot be kept under control and the incident with reactor causes a dimensional drift. Here alien entities intervene. Anybody being touched by them looses his/her identity and becomes like them. Konig tries to enter the nuclear reactor room in his protective gear to save his friends, but also becomes a victim and behaves like them. They cannot be saved, but Marshall can prevent a general disaster.

We can't leave him in there alone- I am going in