This is a list of all known publications in the Archie Sonic the Hedgehog series that have gone unreleased, with no future release dates currently planned, thus rendering the original series' that they were a part of defunct.
As of now, the entire Archie Sonic the Hedgehog line has been discontinued due to SEGA's ending of their partnership with Archie Comics Publications.
Even before the lines discontinuation, several graphic novel series' being released by the company ended up cancelled. While never officially stated, potential reason could be due to behind-the-scenes legal troubles concerning the comics Pre-Super Genesis Wave Timeline, which the vast majority of these books contain reprinted stories from. Other reasons for cancellation may merely be down to poor sales of the series' they were a part of.