From what I understand, it was only a TV special. I remember seeing it years ago. They simply took two scripts Serling wrote and put them to film. Whether they were intended to be Twilight Zone scripts back in the 1960s or not is unknown, but commercially it was intended to attract an audience for obvious reasons.

They were not even done in the fashion of the 1960s TV series. If you want to see a really good Serling drama that can be considered a "lost" Twilight Zone episode, find "The Time Element," broadcast on THE DESILU PLAYHOUSE in 1958. It starred William Bendix as a man who travels back in time and attempts to warn everyone that the naval base on Pearl Harbor is going to be bombed. Of course, he doesn't succeed, but in Twilight Zone fashion, it rocks and Bendix gave a superb performance. Serling took the premise and divided it into two different episodes of the regular series, later on: "Perchance to Dream" and "Back There" and it still worked.

I know the pilot has never been released commercially on DVD but it can be found in collector hands, and is being shown in the movie room at the Mid-Atlantic Nostalgia Convention in Maryland in September.