Walter Andrews

Pre Mutant Charge
He is the older brother of main villain, Zack Andrews. At first, the brothers got along with hiding their powers from the world. Eventually Zack became aware of what happens Mutants but Walter wouldn't believe him and they had a fight ending when Zack, admitting defeat, ran away "never to be seen again" and Walter's powers were suppressed by the government telling him that people were not ready for superior beings like him, so he went to graduate college but never got a job, until now.

Mutant Charge
Zack comes back to enslave humanity Walter, having no powers, gathers Joey Bloom, Steve Joel, Ashley Sly to become the new Power Rangers. He throws away a disfunctioning Morpher which is found by Max Peterson, who becomes the Black Ranger then he gives a Morpher to Katie Venn the Green Ranger. He figures out that his powers will return (He was not told this by the Government) he just doesn't know when. Sam Linnet gives the Rangers a power gem he found and Walter makes it into a Morpher and it is stolen by a Mutant but recoved by Sam. Zack attacks base and seemingly kills Walter and drains the powers from the Morphers. Walter's powers return and restores power to the Morphers so that the Rangers defeat Zack and send him to jail. The Rangers gives back the Morphers and moves on with their lives.

Kingdom Power
Even though he is not in the Mutants and Kingdoms 2 parter, Walter gave back the Morphers so that they could send Zack back to jail and destroy the Hybrid. It is implied when Prince John (Red Kingdom Power Ranger) asks "Who gave you back your Morphers?" in which Steve replies "Our mentor." hinting that they visited Walter before saving the Kingdom Power Rangers.