TORONTO, Ont.-When a message popped into his email box with the subject line, "Draw for a Marvel Comic?" David Cutler almost deleted it, thinking it was a scam. Yes, he was an artist. And yes, he'd tried to get in Marvel's sites . . . but his attempts had never succeeded in landing him a job there, and it had been a few years since he'd tried.

But just in case, he opened the email instead of clicking delete. And there was the dream invitation in black and white. The invitation to work on a new Marvel book. Marvel's Voices: Indigenous Voices #1 features stories about Indigenous and Native Am...