Fan CastingTransformers (2017)

Several thousand years (steller cycles) ago, the planet Cybertron was consumed by a civil war between the two Transformer factions, the Autobots led by Optimus Prime and the Decepticons led by Megatron. Optimus jettisoned the AllSpark, an all-powerful mystical artifact that brings life to the planet and non-biological forms, into space, but Megatron pursued it in spaceship form. Megatron crashed onto Earth, landing in the Arctic Circle and froze, and was discovered in 1895 by explorer Captain Archibald Witwicky. Witwicky inadvertently activated Megatron's navigational system, which etched the Allspark's coordinates into his glasses. The glasses eventually end up in the possession of his great-great-grandson Sam.