Power Rangers peeps, help

Because I'm better with the more recent series, nowadays, given the lack of repeats on any channel I get.I have a vague idea for a fic, and I need to know were there any villains who specifically wanted to enslave everyone? Institutional, planet wide slavery/conquering, not specific individual slavery. I feel like maybe the demons in Lightspeed did? But I really can't remember. Anyone got any ideas?