Due to the cancellation of the animated series "Sonic Underground", its storyline was left unresolved. However, staff members involved in Archie's Sonic the Hedgehog comics had considered finishing the storyline: writer Ian Flynn had thought about writing a new story that could serve to wrap up where the original series left off, but felt it would be "stepping on the original creatives' toes," and that even if he was allowed to do it the story likely wouldn't see the light of day for at least two years. Originally, "Sonic Universe" issue 50 was intended to be the official epilogue for the show, with a preview cover being released. However, the epilogue was cancelled, and the issue instead featured a story centered around Metal Sonic.

In early 2013, Ian Flynn revealed that material from "Sonic Underground" was off-limits: this was the reason why the epilogue was put on hold. He also stated plans to include the epilogue as part of "Lost Hedgehog Tales", a written document featuring Sonic comic material that will no longer be used, suggesting that the epilogue was no longer possible. In June 2017, any chance of a "Sonic Underground" epilogue by Archie was precluded when Sega announced that the comics produced by them had been cancelled.