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Let the speculation begin: EW has learned that Oscar-winning writer-producer John Ridley (12 Years a Slave) is teaming up with Marvel to develop a mysterious new TV series.

We hear the deal involves reinventing an existing Marvel superhero character or property for ABC—but all sides are staying quiet on exactly which title Ridley is adapting.

This comes on the heels of EW breaking the news that Marvel and ABC are also developing a spinoff series to The Avengers tie-in Agents of SHIELD.

Ridley is an executive producer of ABC’s acclaimed midseason drama American Crime, which we hear is looking good for a second season renewal. Coming off winning best adapted screenplay for 12 Years a Slave, Ridley is also a writer/producer on the 2016 big-screen update of Ben Hur.

Marvel’s aggressive expansion into television now includes four current series (ABC’s SHIELD, Agent Carter—which is on the bubble for a pickup—and Netflix’s Daredevil), plus several confirmed upcoming titles (Netflix’s A.K.A. Jessica Jones, Luke Cage, and Iron Fist, followed by the Netflix character mash-up The Defenders). Neither Marvel nor ABC would comment on the Ridley project.