Sonic Adventure Episode 7: City Under Attack!

Having escaped the Egg Carrier, Amy and Tails somehow manage to make it all the way back to Station Square. Unfortunately, Eggman has also wound up there thanks to Sonic knocking out the control system on his hovercraft. Thinking Eggman is no threat at the moment, Amy heads for the Mystic Ruins in search of the Flicky's family. Tails isn't as certain and decides to check on Eggman, only to find out the madman is going to launch a missile into the city! The young fox quickly realizes Sonic can't help him and now he has to stop Eggman from destroying Station Square all on his own, if he can get to the missile before Eggman does...

Meanwhile, both Gamma and Knuckles have returned to the Mystic Ruins. The robot finally breaks free from Eggman's control, and decides it must save the animals trapped in the other E-Series robots. With the final Emerald Shards in hand, Knuckles fully restores the Master Emerald and Angel Island returns to it's rightful place in the sky.

Back in Station Square, Tails managed to beat Eggman to the missile, but now he has to fight the madman in his massive Egg Walker. Tails knows Sonic taught him everything he needs, but still the young hero-to-be has a tough battle in front of him...

Finally, Sonic has made it to the center of the ancient ruins, and upon discovering a mural of a massive water monster destroying an ancient civilization, our hero is shown a fiery vision of the past. Upon returning outside the temple, Sonic spots a very humiliated Eggman returning to his base and our hero gives chase in the hopes of stopping the doctor once and for all...