The year given for this episode is 1978.
It's never explained just how the Flying Sub manages to land on and take off from the aircraft carrier.
Hal Toney (Commander), Preston Hansen (Flight Control), Lee R. Delano (Technician), Ray Didsbury (Sonar), Bill Hickman and Jim Van Niekerk (Divers)
This was the first of four outings for Wayne Heffley as the Ship's Doctor.
During the climactic scene when the blob is being electrocuted, Crane and Morton both begin to jerk about in reaction. Riley, on the other hand, simply stands watching the proceedings until they all abruptly collapse to the floor.
Crane: I told you there was no use trying to fight it, Admiral.
Nelson: I'm sure you fought it, Lee.
Crane: That's why I tried to warn you.
According to the book Irwin Allen Productions by Jon Abbott, the scene where the creature bursts through the door into the lab was supposed to be more extensive. It was a one-shot deal. The breakaway door refused to give way on cue, and when it finally did, the creature and all the actors tumbled through--and burst out laughing, ruining the shot.