"This is actually my favorite episode," Margot Robbie told AOL TV on the New York set of the ABC drama. "I think it's my favorite episode so far. Berlin, I really, really love, but this one I literally couldn't put the script down, and I'm not just saying that."
In 'Unscheduled Departures,' the crew encounters serious turbulence -- both inside and outside the plane -- on the way to Caracas, Venezuela. A passenger suffers a heart attack and it turns out there's no doctor on board the flight. Ted (Michael Mosley) and Colette (Karine Vanasse) venture out on their own to find help.
"It was one of my favorites too," Mosley said. "There's just an adrenaline to it that's just really exciting. In prior episodes, there'd be two or three of us here and there, going off to do different things. In this one, we're all facing the same direction."
While searching for a doctor and medicine, Colette gets to use her native language.
"We take off, we're not supposed to go to Haiti, but finally because of a hurricane and because of somebody being sick on the plane, we have to land," Vanasse said. "Once we land, we sort of see that, well, we didn't chose the right place to land."
Along with the drama off the plane, the ladies have to deal with guest star Aaron Diaz. In the episode, the multi-talented Mexican star plays Miguel, a charming and wealthy passenger who has charmed the stewardesses with promises of yacht trips.
"It's like an action movie in one episode," Robbie said. "It's incredible ... The stakes are so high, it's gripping."
Check out an exclusive preview of the episode below.