The 19-year-old "Once Upon a Time actor" will be playing a new character in the Heroes spin-off, reported Deadline.
He will star opposite fellow newcomer Zachary Levi, as well as Jack Coleman who reprises his role as Noah Bennet in the series.
Milo Ventimiglia, Zachary Quinto and Ali Larter are among the original stars who have ruled out their return.
The show has been given a 13-episode order by NBC and will premiere later this year.
Kay has previously been seen in "Pirates of the Caribbean: On Stranger Tides" and "Hannibal Rising".
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