 Producer Ray Dorn (qv) "borrowed" much of this movie for his own  movie _Journey to the Center of Time (1967)_ (qv).  Irwin Allen (I) (qv) also borrowed much of the concept for his TV  series _"Time Tunnel, The" (1966)_ (qv). Director Ib Melchior (qv)  declined to make waves so that he would continue getting work in  Hollywood.