After Heatwave revived the original 13 Primes, he believed Sentinel Prime deserved a second chance, so he revived him. Then, after hearing that Sentinel was an ally of the Quintessons, Heatwave betrayed him and started fighting him. Then Megatron, who believed Sentinel was very evil, helped Heatwave fight Sentinel, until Heatwave successfully killed Sentinel. Then, Megatron switches sides to the Autobots.
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