Boom! Studios heavily departs from the original Power Rangers canon established during the Mighty Morphin and Zeo TV series, but what they've crafted here is unmistakably an amazing new divergent path that sees Rita Repulsa in a new villainous role as Mistress Vile. The end of Mighty Morphin Power Rangers #110 (by Melissa Flores, Simona Di Gianfelice, Raúl Angulo, Jose Enrique Fernández and Ed Dukeshire) marks the official beginning of the "Darkest Hour" comic event, and Dark Specter's awakening.
Source:https://www.cbr.com/power-rangers-comics-lord-zedd-alliance-darkest-hour/