The Dinobots continued hiding out in the Cascades , stealing fuel from humans and sending Swoop out to spy on the Autobots at the Ark. Learning that Optimus Prime was dead, Grimlock decided to return and seize command for himself. Bursting into the Ark, he denounced Prime's style of leadership as weak and insisted only the strongest should lead but was soundly rebuffed by the assembled Autobots. Meanwhile, Ratbat , the Decepticons' fuel auditor on Cybertron, had sent Trypticon through the space bridge to annihilate the Earthbound Autobots once and for all. Outside the Ark, the Dinobots stood back and watched the slaughter for a while until Trypticon threatened Rachel Becker , a palaeontology student who had taken an interest in the local Transformer activity, which drove Grimlock to defend her. Following their leader's example, the other Dinobots charged, battling Trypticon until his fuel quota for the trip was expended and Ratbat recalled him to Cybertron. For showing courage and compassion in during the battle, the grateful Autobots then elected Grimlock as their new leader. King of the Hill!
In the aftermath, Optimus reveals to the Autobots that he emptied the AllSpark into the Matrix within him, but can no longer be separated from either, requiring him to sacrifice himself to completely restore Cybertron. The Autobots try to dissuade him, but Optimus states that the Matrix cannot be restored again, and that the age of Primes is over, but recognizes each Autobot - even Knock Out - as a Prime in their own right before taking off into the core as the Autobots watch. As Optimus plunges into Primus, millions of sparks of all the deceased and unborn Transformers emerge from the Well, including Prime's own spark. The film's final moments mirror Optimus' last words, as he states that his sacrifice will mark a new beginning rather than the end to anything - "simply put, another transformation".
When a Cybertronian probe was detected, Dinobot helped his teammates attempt to contact it, despite the fact he dreaded a return home. After all, he was a criminal even in Predacon terms, and he had no hope for a warm Maximal reception. Somewhat fortunately for Dinobot's potential fate, their attempts to catch the attention of the probe failed when Tarantulas invented the transformation lock lens . The Probe The issue was raised again when the Maximals thought that the Predacons had been destroyed. Dinobot elected to remain on the planet while the Maximals repaired their ship and launched it. However, just as Dinobot wandered off to explore the world that had become his, he stumbled across the not-so-dead Predacons, who attacked the Axalon and grounded the Maximals once again. Victory