Zeo, but RPM comes at a really close second.

Zeo has my favourite core cast of rangers (Kat > Kim IMO and Tanya is more interesting than Aisha, it had an excellent aesthetic, good villains and then brought back the original red ranger. I could watch that series again and again.

And then Turbo came along and ruined it :(

Speaking of villains, Astronema was damn fine, especially with red hair.


... but yeah, I'm still a sucker for the first few couse those were the ones I grew up with. Space was hella good in its own right, and Lost Galaxy sort of came by extension because I wanted to see how things ended up.