Obvious spin=off of the power rangers, but it only had three characters and they went to a cave/labratory whenever they were called to fight the bad guys... I don't know if it was a summer knock-off of the power rangers, or it's own thing?? It was basically the power rangers, but less 'rangers' and a smaller budget?

This sounds a lot like "VR Troopers" where there were 2 guys and a girl who fought the bad guys or creatures if you will. I still remember the theme song! :)

It was VR Troopers, you're right, Thank you!!

You're very welcome! Happy to help out when I can! :)