I remember the episode. The concept of the guy creating Quasar Matter using a Cyclotron is a bit extream. But this was one of my favourite episodes. A lot of what happened in the last act was unexplained, though. The Particlians want into the secured vault and took out the device that the Proffessor had left there and brought it (undamaged) into the containment area.I think it wasn't so much an invasion as a reaction by them to what they belived was an attempt to invade by us. They targeted the vault and found what they needed there to seal the breach between the dimensions. Perhaps that was always their intentions. Maybe on the other side of the breach, they were dying. Maybe this should have been the closing narration:"Battle joined. Casualties? Yes. Resolution: Victory, of a sort. A painful step from the crib of destiny. On another day, a friend, perhaps, instead of a deadly peril..." — The Invisible Enemy (The Outer Limits)   See 1 other reply