Watch Back to the Future (1985) HD Full Movie Free on SolarMovie. Watch Back to the Future (1985) online free. Marty McFly, a 17-year-old high school student, is accidentally sent 30 years into the past in a tim...Marty McFly, a 17-year-old high school student, is accidentally sent 30 years into the past in a time-traveling DeLorean invented by his close friend, the maverick scientist Doc Brown.