Mummy Dearest

After stealing back a book engraved with the royal seal from Robotnik, the sonic trio discover that a prophet had foreseen Robotnik's takeover of Mobius, and has also foreseen his defeat!
To even more surprise, it is revealed that the prophet also wrote down what he had foreseen on a scroll, which sonic and his sibling's quest for.
The journey takes them through the treacherous Mobius desert [sandopolis or whatever you want to call it] and many perils and traps.
But the underground prevail and locate the temple where the scroll was long hidden. In the meantime, sleet and Dingo, also find the temple, and pretty soon, the stage is set for a battle to decide the future of mobius..

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S01E23 - The Hedgehog in the Iron Mask