Due to their small size, the Mini Dinobots were allowed free reign of the junkyard premises. They often hung out in Cade Yeager 's personal trailer, and Cade even trained Mini Strafe (who Cade nicknamed "Pterry") to fetch beers for him from the fridge. When Cade returned to his trailer with the orphan Izabella , he found the Mini Dinobots wreaking havoc in his trailer, especially since Mini-Grimlock had acquired the ability to breathe fire. That night, the Mini Dinobots spent the night with Izzy, and gave her a pleasant surprise when she woke up the next morning. Mini Strafe was later present when Daytrader gifted the Autobots with the Knight Ship . The Last Knight
That all said, Mini variations of established Transformers aren’t an entirely new concept in the franchise – as “Mini-Cons” have long been part of Transformers mythology. In the animated series and comics, Mini-Cons were smaller Transformers that bonded with larger bots – giving their bigger partners new abilities or weapons. Based on what has been revealed of the Mini Dinobots, they don’t appear (right now) to fit the parameters of Mini-Cons but with Transformers 5 digging deep into expansive Transformers mythology , it’s still possible the Baby bots will be more than just comic relief.
According to the biography printed in the Transformers Collectors Club magazine, Slag and Sludge were part of Grimlock's band of Decepticon hunters on board the ship Graviton . When Grimlock left Ultra Magnus in charge to join Optimus Prime on Earth, Slag and Sludge departed the Graviton , not wanting to be under the command of Magnus. The two Dinobots went off on their own, and happened across Nightbeat. Nightbeat offered them a job as muscle, which they took because they figured Nightbeat has a nose for finding trouble, which they enjoy.