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The Mindy Project” may be breaking new ground on Hulu, but its tradition of casting the starriest of guest stars continues.

Joseph Gordon-Levitt will guest on the season four premiere of the show, which makes its Hulu debut later this year.

The premiere episode will be inspired by the 1998 Gwyneth Paltrow rom-com “Sliding Doors,” according to Buzzfeed. Mindy Lahiri (Mindy Kaling) is no longer with longtime boyfriend and co-worker Danny Castellano (Chris Messina) in the new alternate universe, but married to Levitt’s character, a Bravo reality TV producer. The character brings their connection full circle as Kaling and Messina recently guest-starred in the season two premiere of Levitt’s Pivot series “HitRecord on TV.”

In other casting news:

“The Goldbergs” star Natalie Alyn Lind has joined the cast of Fox’s “Gotham” as Bruce Wayne’s new love interest, Silver St. Cloud, Entertainment Weekly reports. St. Cloud is described as “an ethereal beauty with the pristine manners of a Gotham debutante,” who also lost her parents at a young age. But we may not want young Bruce to get too close to the blonde beauty, as she is described as having “a heart beating with dark intent.”

“True Bloods” alum James Frain has already joined the series as a new villain, St. Cloud’s billionaire uncle, Theo Galavan. Frain reportedly acts as a father figure to Bruce in season two.

The second season of “Gotham” premieres September 21 on Fox.

In other DC Comics news, CW’s “The Flash” has cast WWE star Adam Copeland as Atom-Smasher, according to ComicBook.com. Atom-Smasher will differ from his heroic comic book counterpart. In fact, he’s come to Central City to kill the titular hero character.

As his name suggests, Atom-Smasher has super strength and the ability to grow to enormous size.

Copeland will appear in the first episode of the sophomore season of “The Flash,” which is set to bow in October on the CW.