Katherine Langford, the Golden-Globe-nominated star of Netflix's "13 Reasons Why," is in "Avengers 4," but we have no idea who she's playing.

The Wrap reports she's already completed filming her role, whatever it is. Fan spec is that she could be playing an older Cassie Lang (daughter of Ant-Man Scott Lang) or Kate Bishop, who takes over as Hawkeye in the comics.

Although she's no longer on "Thirteen Reasons Why," she recently landed another Netflix series. She'll star as Nimue in "Cursed," a new take on King Arthur.

Nimue is a teenage heroine with a mysterious gift who is destined to become the powerful Lady of the Lake, according to The Wrap. (And will be, if we remember our Monty Python correctly, handing out swords and kingships accordingly.)

[Via The Wrap]