Teasers aired alongside MMPR reruns in the break between seasons (focusing mostly on Rita & Zedd and the incoming machine army invasion) and Power Rangers Zeo kicked off April 20. The first-half (which aired Saturday mornings in the spring) was mostly filler episodes and got dull pretty quick. I still remember getting up early to watch it, while my sister and mom would be out shopping.
The second-half aired weekdays in the fall and things really picked up with the debut of the Gold Ranger (what I still consider one of the greatest storylines in 19 seasons), as well as other creative episodes.
A slow start, but some great storylines & episodes later on and still kind of the beginning of me being a big Ranger fan. Check out my tribute to the story, and characters, complete with a Gold Ranger music video: