Following the events of the first film, Marty McFly finally returns home to Hill Valley in 1985, while Doc Brown departs for 2015 in the DeLorean time machine. Meanwhile, the Autobots and Decepticons scuffle for the time machine. Marty unexpectedly wakes up in a dystopic present when the Decepticons killed most of the Autobots and successfully conquered Earth, with Megatron having Biff Tannen as his second in command. Luckily, a time-traveling Cybertronian named Gigawatt locates Marty for help.

After a tough and confusing encounter with Starscream, Marty decides to trust Gigawatt, who is joined by Skilz, another Cybertronian disguised as Marty's skateboard. The group meets the surviving Autobots led by Rodimus Prime, who reveals that Doc was unintentionally responsible for the chain of events: when he traveled forward to the year 2015, he met Decepticon Rumble, who survived his encounter in 1985. Doc befriended Rumble, unaware of the latter's agenda. When the DeLorean was completely repaired, Rumble used it to travel back to 1974, using Biff to develop Energon supplies for Megatron's arrival. Gigawatt then reveals he used to be a Decepticon, but after having enough with Megatron abusing and murdering other human workers, he trans-scanned the DeLorean and escaped, but his flux capacitor was damaged in the process and in order to fix it, they need Doc, who is somewhere forming his own resistance.

Back on Hill Valley, Doc manages to save Biff and Marty's parents from the Constructicons, planning to reunite the last standing Autobots, but Biff double-crosses them and attempts to execute them. Marty and the Autobots arrive in time to save them, defeating all the Decepticons. However, they are confronted by a giant Decepticon disguised as Hill Valley's courthouse named Watchtower.

While battling Watchtower, Doc fixes Gigawatt's flux capacitor, and with Skilz, they both help Marty and Gigawatt enough speed to travel back to 1984, preventing Rumble from awakening Megatron. However, Gigawatt gets critically injured from his previous battle. Marty uses the original time machine to go back to 2015, where Doc and Biff repaired Gigawatt and the Autobots are still protecting Earth and humanity. After returning to 1985, Marty gets a new pickup truck from his parents, unaware it is a Decepticon in disguise.

Comic book edit

The Transformers/Back to the Future series is being written by Cavan Scott, and illustrated by Juan Samu, as part of the 35th anniversary of Hasbro's Transformers and Universal Pictures' Back to the Future.^[1]

Toy edit

As part of the Transformers Collaborative toy line, Hasbro released a toy figure based on the original character Gigawatt, which is based on the DeLorean time machine.^[2]

• IDW Publishing's official announcement