This could possibly be a sequel or feature length reboot to "The Last One" (Stephen Harrington, 2016). Possible added features would include, an origin story for both Harriet Day and The Masked Man, and a new villain.
Stephen Harrington has also stated that this could be a reboot to focus entirely on The Masked Man, years before Harriet Day's storyline.
Rumoured to be a solo/prequel film to focus mainly on The Masked Man.