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When you've worked together long enough on a TV show to reach the 100 episode milestone, chances are you're going to know your co-stars pretty, pretty well. And that's definitely the case with the stars of Once Upon a Time.

E! News caught up with the cast of the hit ABC fantasy series on the red carpet as they gathered to celebrate the big occasion, and there was no better time to put their knowledge of one another to the test with a little game we like to call "Most Likely To: Fairy Tale Edition." The rules were simple: We'd throw out a familiar fairy tale plot point and Jennifer Morrison, Colin O'Donoghue, Jared Gilmore, and Josh Dallas would have to tell us which of their co-stars the scenario fit best. 

So, who wound up being deemed most likely to bite into a poisoned apple or fall apart after midnight? Well, you're going to have to press play on the video above to find out!

Josh Dallas, Ginnifer Goodwin, Jennifer Morrison, Lana Parilla, Once Upon a Time

ABC

When Once Upon a Time returns with its mideason premiere on Sunday with the momentous episode at the center of all the festivities, it's down to the Underworld for Emma (Morrison) and the gang as they journey to rescue Captain Hook (O'Donoghue). Along the way, they'll encounter more than a few familiar faces, as the Underworld—a Bizarro-world version of Storybrooke—is full of souls with unfinished business and plenty of personal vendettas. And you just know almost all of those vendettas are with our heroes.

Returning to stir up some trouble in the 100th episode are Peter Pan (Robbie Kay), the Blind Witch (Emma Caulfield) and Regina's (Lana Parrilla) mommie dearest, Cora (Barbara Hershey)—along with a few surprises, naturally.

Once Upon a Time's 100th episode airs Sunday, March 6 at 8 p.m. on ABC.