The episodes are roughly 30 minutes each. Both are one heck of a trip, and the pace is as fast as Sonic himself. Though Sonic sounds a bit gruff, the voice actors are pretty cool, and the new character, Sera, is a nice addition to the cast.
The President of Sonic's world and his daughter Sera are held hostage by arch-villain Dr. Eggman (Robotnik in the U.S. version). When Sonic and Tails come to the rescue, they are confronted with a much greater threat: the generator in EggmanLand is about to overload and destroy the whole planet in the process, and only Sonic and Tails are fast enough to reach it in time and prevent the explosion. But on their journey the two friends have to face a lot of obscacles, the most dangerous one being a gigantic robot called Dark-Eggman. Luckily, Knuckles the Echidna joins them in their adventure.
Will they be able to make it in time?
After the shutdown of the Egg-Generator, Eggman releases his latest creation to destroy Sonic the Hedgehog: Metal Sonic, a robot which has the same speed and abilities as the real Sonic - and more. After Sonic has lost his first fight against Metal Sonic and everyone is desperately searching for a way to stop the robot, a new danger arises. Eggman ordered his creation to destroy the Ice Bridges on the North Pole that hold the floating continents of Sonic's world together, which would cause them to drift into space and dissolve.
Will our friends be able to stop Metal Sonic (who proves to actually have more of Sonic inside him than just a copy of his abilities) and save their world from destruction?
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review of part 2.