It's Crittermas time in Trinyvale! To celebrate, our heroes head to the pocket plane of Mobius to visit their old pal Keychain, but instead are greeted by a familiar blue hedgehog and news of a great tragedy! Jen finds a father-figure, Onyx adapts a porcine persona, and Nyack tussles with Tails as part 1 of the Merry Metal Mayhem saga unfolds!