Mash-up between Back to the Future and Chrono Trigger.
The point of connection between the two is, of course, time travel.
I really love both the movie trilogy starring Marty McFly and Doc Brown and the classic videogame by Squaresoft from the SNES era.
They were milestones in the middle of my childhood.
Larger version of this illustration HERE
You can take a look at other stuff I make HERE