Transformers Prime: Stone (Optimus x Arcee)

Team Prime was battling Megatron over an energon source. The Autobots almost won. But Arcee had gotten shot by a strange blast from Megatron's cannon. Megatron then fled from the battle ground with an evil smirk on his face. Arcee only got an Energon Leak, nothing super serious. Everything seemed fine tell a few days later......