When a franchise is rebooted, the line is usually pretty clear: everything after a certain point is canon, and everything that came before it is in a completely different universe. But this isn’t a hard-and-fast rule, as James Gunn’s tenure as co-president of DC Studios has proven. While everything produced after Creature Commandos is considered canon to the new DCU, events from the past that are referenced in canon works have retroactively been made canon, too.
For example, Peacemaker Season 2 is canon, but Season 1 isn’t. Therefore, only the events in the “Previously On” section of Peacemaker Season 2 are canon. Confusing? Definitely. But it’s otherwise a decent way to make the transition to a new universe as seamless as possible while still maintaining what worked. And in the spirit of that approach, a forgotten hero from a major DC movie is getting the same treatment and returning to the big screen.