He subsequently starred in the comedy Sixty Six,[8] as Bernie Rubens, alongside Helena Bonham Carter, Eddie Marsan and Catherine Tate.

[9] Sulkin also played the role of JJ in the Disney Channel comedy, As the Bell Rings,[8] worked on a CBBC children sci-fi show The Sarah Jane Adventures (spin-off of Doctor Who), playing Adam in series 3 two-episode story The Mad Woman in the Attic.

In 2012, Sulkin starred in the American teen drama series Pretty Little Liars as a recurring character, Wesley Fitzgerald, brother of Ezra Fitz.

[16] In February 2013, it was announced that Sulkin would play Julian Fineman in FOX's television adaptation of Lauren Oliver's young adult novel, Delirium.

[18] Sulkin starred in the leading role of Sam Fuller in the horror-thriller film Don't Hang Up which was released in theatres on 10 February 2017.

[19][20] Sulkin also played Chase Stein on Runaways, a Hulu series set in the Marvel Cinematic Universe.