The Autobots' leader is the biggest, strongest, and smartest of them all. He's always awesome, whether he's in big-rig mode, or as his blazing red-and-blue-armored self. Optimus Prime runs the team in all things, including protecting the humans from danger as he and the Autobots continue in the war with the Decepticons. You wouldn't call Optimus Prime 'cuddly', but he does care. He's just seen a lot of battle ... and he knows there's more to come.
Their true sparks have gone out, but some Autobots and Decepticons rise again as Terrorcons -- zombie Transformers who serve Megatron. He reanimates them using Dark Energon, the blood of Unicron. Megatron even tries to reanimate all the corpses on Cybertron to fight the Autobots on Earth ... but fails. Both Cliffjumper and Skyquake show up briefly as Terrorcons.
He was just a hard-working kid slinging burgers to save up for his dream...a motorcycle. Then Jackson 'Jack' Darby meets Arcee, his guardian Autobot and his dreams come true. Talk about SCORE! Jack gains a killer bike AND a big sister all in one. With pals Miko and Raf, he helps the Autobots fight the Decepticons. Jack's usually smart and responsible, guess that makes him a leader ... except when he wants to impress a girl.