Black to the Future

Marty McFly lives in Hill Valley with a troubled family; his mother Lorraine is depressed and alcoholic, his siblings are failures, and his father George is bullied by Biff Tannen. Marty faces fears about becoming like his parents after his band fails an audition and he confides in his girlfriend Jennifer about his worries. His daily life highlights personal and familial struggles in his hometown.

Marty meets his eccentric scientist friend, Doc Brown, at the Twin Pines mall parking lot. Doc shows off his new time machine built from a DeLorean, powered by stolen plutonium, intended for time travel experiments. The duo plans to test the device by traveling back to November 5, 1955.

During the planned experiment, Libyan terrorists arrive and gun down Doc, who was swindling them for plutonium. Marty escapes in the DeLorean and inadvertently activates the time machine, reaching 88 miles per hour. He is suddenly transported back to the year 1955, landing in the past amidst chaos.

Marty discovers he has no plutonium to return to 1985 and begins exploring the town. He encounters his teenage father George and realizes Biff's bullying behavior has been ongoing. Marty saves George from an accident, but this action begins to alter the future and creates complications for his own existence.

While trying to blend in, Marty becomes unconscious after an accident. Lorraine, the young version of his mother, cares for him and begins to develop romantic feelings. Marty learns that his presence is impacting her, and he plans to ensure her relationship with George is restored.

Marty and Doc discover the key to return to 1985 is a lightning strike predicted at the courthouse. Doc confirms that a bolt of lightning can produce the necessary 1.21 gigawatts of power. Marty shows Doc a future flyer about the storm, risking further alterations to the timeline.

Marty attempts to get George and Lorraine together before it's too late, planning to have George rescue Lorraine during the school dance. His plan involves faking inappropriate advances to trigger George’s heroism, but it goes awry when Biff’s gang interferes and Biff assaults Lorraine, causing George to interven and fight Biff.

George’s intervention during the dance results in him and Lorraine sharing their first kiss, ensuring their future relationship. Marty hurries to the courthouse to witness the lightning strike that will send him back to 1985. He manages to calibrate the DeLorean for the return trip just in time.

The lightning strikes, activating the DeLorean's return to 1985. However, the vehicle breaks down, forcing Marty to run back to the mall and arrive as Doc is being shot in a confrontation. Marty’s intervention saves Doc’s life, as it is revealed that Doc had foreseen the attack and wore a bulletproof vest.

Marty and Doc discover that their actions in the past have significantly altered the present. Marty's family is now successful and confident, with his father as an accomplished author, his mother happy and fit, and Biff subservient. The changed timeline presents a vastly improved Hill Valley.

The next morning, Marty sees the positive changes in his family and reunites with Jennifer. Suddenly, Doc reappears in the DeLorean, inviting Marty and Jennifer to travel to the future to prevent their children from falling into terrible fates, setting the stage for future adventures.