George Macready stars as Dr. Marshall, head of the BroadbBridge nuclear facility that one day has a tragic accident occur, as a fresh infusion of irradiated subatomic particles in a cyclotron comes into contact with an isotope that somehow causes an inter-dimensional crack to open, enabling an unknown but inimical form of super energy to emerge, taking over every worker it comes into contact with, leaving the protective suit empty of a man, but instead housing the energy. How can Dr. Marshall stop this emergency from escaping into the wider world, and having the crack turn into a door? Leonard Nimoy costars in a small role. Aptly titled episode may not make much scientific sense(though that is cleverly set up in the story) but remains fascinating viewing. Deserves credit for sheer ambition and narrative audacity.
