Arty is not a rock star. He's in therapy. Doc has been gone for over 30 years. The 2015 he thought would be has come and gone without the flying cars or hoverboards. He's beginning to wonder how real it all was until Doc returns with a crazy plan to change the past. But, something goes wrong, and it's up to them save history. More questions arise when an old friend appears to ensure that history goes as planned.