Calcifire

This monster, known as Calcifire, was created by Rita Repulsa (not this one) to take down the Pink Ranger.

Biography
Originally, this monster was summoned by Rita Repulsa to kill the MMPR Pink Ranger on Season 3. However, MMPR was a kid's show, so killing was not allowed.

They decided that it would be too predictable, so the Interdimensional Guardians decided to change the plot. Calcifire was now hired by Rita Repulsa to exterminate all the wildlife, because Rita Repulsa hated Earth's animals for some reason. Meanwhile, the red Mighty Morphin Alien Ranger was hanging out with the Pink Ranger, when suddenly, they saw Calcifire destroying all the wildlife. The Pink Ranger sacrificed her life to protect the wildlife from Calcifire and died. The Red Alien Ranger took this seriously and avenged the Pink Ranger by killing Calcifire once and for all.

Behind the scenes
WAIT A MINUTE! I RECOGNIZE THIS PLOT! YOU'RE COPYING THE PLOT OF KAKURANGER EPISODE 25, AREN'T YOU?