We're nearing the end of season 1 here, with the second-from-last episode Beating Eggman (part 1). In the first half of this two parter, the president decides to take action against Robotnik. They're going for a full-out attack on his base, and they have the help of Rouge and Topaz, who already know the inside of the structure. Meanwhile, Sonic and co. locate another chaos emerald, and give chase for it.
I must say, this is a very good idea. There's no better way to end a season than with an epic battle against the villan, and Sonic X pulls off the first half pretty well. There is never a dull moment in the whole 20 minutes, and it certainly made me want to get right to part 2. The only thing I could have done without was the transition narrator at the end.