Austin St. John, who played Jason in Mighty Morphin Power Rangers, eventually exited the show and would only return to the franchise a few years later. Though there have been dozens of Red Rangers, it is difficult not to think of Jason when it comes to Power Rangers leaders. Despite being part of Zordon’s team for less than two seasons, Jason wrote his name in Power Rangers history as one of the most iconic Rangers that ever was.
https://screenrant.com/why-original-red-ranger-actor-quit-power-rangers/