Former Doctor Who actor Matt Smith is reportedly set to join Jared Leto on Sony's superhero vampire flick, Morbius.

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Smith is in final talks to sign on, according to Variety, and while his role is being described as a major one, it is ultimately still unknown. Speculation, however, has begun to mount that the role could be Michael Morbius' friend-turned-enemy, Loxias Crown. The villain will reportedly suffer from the same blood disorder as Leto's title character and remains the only piece of the puzzle missing.

In the comics, Crown used the experimental blood serum developed by Morbius to transform into a bloodthirsty, superhuman creature of the night, resulting in Morbius trying to stop his sanguineous rampage. Crown was created in the pages of 1997's Spider-Man #76, written by Howard Mackie and illustrated by John Romita Jr. He took on the villainous alter ego Hunger, with the comic book incarnation of Crown being a vampiric mutant who forced Spider-Man to team up with Morbius and Blade to take him down.

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Recently, another major role was locked up with True Detective's Adria Arjona coming on board as the female lead and Morbius' love interest, Martine Bancroft, who also succumbed to vampirism in the comics, gaining her own set of dark powers in the process.

Directed by Daniel Espinosa (Life) from a script written by Burk Sharpless and Matt Sazama (Lost in Space), Sony's Morbius stars Jared Leto. A release date for the film has yet to be officially announced.