The Dinobots were created by the Oracle to aid in the battle against Megatron's Vehicons. At his death, the Maximal Dinobot's spark, containing all the data gathered in his life, had joined with the Allspark and so was available to the Oracle. The Oracle reformatted a group of survivors of Megatron's virus and Vehicon hordes using dinosaur DNA information from Dinobot, giving them new technorganic bodies. And with the addition of the spacefaring Predacon warrior Magmatron, the new Dinobots were born.