I'm not sure how well it would fit into season 3, but I think there could be an awesome episode focused on 1 vehicon who decided to join the Autobots. The episode could start with a typical day of a vehicon, until it focus on one. This one sees the autobots, sees what they are doing for earth, seeing what they are doing for each other. Then he will reflect back on the decepticons. They are fighting a war, still fighting after their planet had been destroyed. What were they fighting for? What happened to their cause. Now they are just attempting to cause harm and innocent planet, while the Autobots defend it. Finally the vehicon would leave, as his friends try to get him to come back. Now of course the autobots don't trust him, dispite his plea that he needs a cause worthy of fighting for again. Although they don't accept him into the base, Optimus gives him a communication device to be called upon when they need him. As optimus ground bridges away, the vehicon turns and puts a scratch through the decepticon symbol on his chest. What do ya think?