"I think I was so vulnerable and uncomfortable, that I got screamed at," the 40-year-old explained. "But, because this person was number one on the call sheet, there was no safety net for me. So no one had my back."

"I would cry walking off set," Rebecca admitted. "This person would literally look at me in front of the whole crew and say ‘You call yourself an actor? This is what I have to work with? What is this?' I stood there just breaking.'"

But it was also a turning point for Silo actress, who confronted her costar the following day. "I looked at this person," she recalled, "and I said, ‘You can eff off. I'm gonna work towards a tennis ball. I never want to see you again.'"