Quick recap
Centuries after the original war, Predacon criminals led by Megatron steal the Golden Disk and flee in the Darksyde. Optimus Primal's Maximal ship, the Axalon, chases them through a transwarp portal, and both ships crash on an unknown planet. The raw Energon there harms robot bodies, so everyone scans animal forms, like a gorilla, cheetah, rhino and rat. The fight begins over the Energon, the Beast Wars, and over the stasis pods Optimus launched before the crash. Tarantulas reprograms one of them to create Blackarachnia, and Starscream's ghost shows up. At the end, aliens activate a Planet Buster to ignite the planet's Energon. Optimus flies the ship into orbit to detonate its transwarp cell, but Megatron rigged the cell, and the blast seemingly kills Optimus.