A man called Mark Fitzgerald finds a baby inside a peach-shaped capsule whom he names Ian and raises. 21 years later, mysterious monsters called the LegacyBeast begin appearing when humans overcome with their inner desires are taken over by spirits infused with powers related to the Power Rangers from the past. Ian, and four other individuals selected by Mark; Tristan Ramos, a popular high school jock, Abigail Diaz, a aspiring artist, Gavin Mitchell, a wanted computer hacker, and Harris Richards, a CEO of a LGBTQ Foundation begin fighting the LegacyBeast and saving their hosts as the Power Rangers Avatar Legacy. They are later joined by Landen Crawford, who was also found in a capsule as a baby and raised in a rural area, and aspires to become a hero.
Also standing in their way are the Dark Knights Of Heartless, elusive and ruthless individuals from a higher plane who stop the LegacyBeast by sealing their hosts in another dimension, unlike the Avatar Legacy Rangers who use their powers to rescue them, and the DemonBeast, strange and powerful creatures who are a threat to both humans and the Dark Knights Of Heartless. The Avatar Legacy Rangers also count on the secret help of Hayden Clarkson, the owner of the coffee shop Cup Of Joey who transforms into Gear X Legend Black Ranger
