Vin Diesel Teases Possible New Role as Marvel Superhero See the pic the actor shared on Facebook and read about 'The Inhumans.'

 -- Vin Diesel already voiced the role of Groot in this year's hit "Guardians of the Galaxy," but he may be back in the Marvel world in another big way.

Earlier this year, Marvel announced their "Phase 3" plan for movies coming out in the next few years, one being "The Inhumas," set for release in 2018.

On Facebook Sunday, Diesel, 47, posted a picture wearing an "Inhumans" t-shirt with the caption "Are you Inhuman?" in the background.