Journey to the Center of Time

As I understand it, Ib Melchior and Dave Hewitt had a falling out over 1964's The Time Travelers. Both are credited with coming up with the story, but Hewitt left the production and Melchior wrote the screenplay and directed this little sci-fi B-film classic himself. Hewitt wrote his own version of the movie and later directed it as 1967's Journey to the Center of Time, making just a slightly different version. I can't remember ever seeing what is essentially a remake arrive just three years after the first movie's release. But then again, both films were grist for drive-ins where few people probably noticed the similarities. These movies had me scratching my head wondering if I had seen it before on TV where, after repeated viewings, I was able to make the connection between the two films.