Shadow doit s'occuper d'un mission qui concerne une ancienne division du G.U.N qui serait à l'origine de l'accident de l'Ark et de la mort de Maria, il y a 50 ans. Pendant la mission il rencontre un être maléfique de retour qui le transporte vers un monde infernal, qui se fait accueillir par une agence de meurtre, la I.M.P.

After a tragic encounter with the Echidna Tribe, Longclaw accidentally sends Sonic to Hell where he is forced to learn the hardships of surviving on one's own. But at the same time, Sonic learns that there is more to life than trying to survive like making friends and having a good time! But will he live long enough to figure that out?

A new crossover List of Episodes between canon and non-canon(Sonic the Hedgehog(Game/Comic/Series) x Helluva Boss/Hazbin Hotel)