The Flux Capacitors

In 1887, Doc Brown pondered the possibility that live music could literally bend time. So he took the Time Train to 1987, built a dangerously overpowered amplifier wired straight into a flux capacitor, and recruited the only test subjects chaotic enough to try it:
Marty McFly, George McFly, Jennifer Parker… and, for reasons still unclear, Biff Tannen!
They hit the last chord—and time blew a fuse. A temporal shockwave tore through Hill Valley, and the flux capacitor overloaded into a full-scale meltdown!
But When the smoke cleared, Standing in the middle of Doc's lab was a demented and devolved band; identical to the original characters but instead - mutated, and time-glitched rockstar versions!
The freakshow band didn’t say a word. They simply cranked their built-in amps to eleven, and vanished straight into the spacetime continuum.
Now this high-voltage, low-intelligence band pops up all across history—playing unsolicited ’80s and ’90s concerts in places that absolutely did not request them.
​
​And back in Hill Valley, The real Doc Brown has one urgent mission: track down the Flux Capacitors before their paradox-powered tour schedule permanently breaks the timeline…