The Time Travelers (1964)

[Interference]

Well, there goes my Monday - Started with The Tomorrow Man, then on to The Time Travelers and rounded it off with Time Tunnel.

Darn You Tube anyway - and cheers, FB. It's people like you who force me into these untenable situations

[J Riff]

Heh. It's a worthy cause Foxbat. I started when VCRs appeared, around 82, recording every sf/horror/esoteric/you-name-it movie I could, watching and editing out ads whenever possible. Four, sometimes five old movies per tape.
Before that... Plan 9, They Saved Hitler's Brain, etc. were on TV, and not as cult classics! They were still playing them straight. Then MST came along and now it's not so much fun anymore.
However - these old, obscure, low-budget flicks from the 60s or before - are dodgy to start with, Ed Wood included. I wouldn't worry about acquiring copies however you can, as long as you don't redistribute. You are a SF writer. They are for research.