Monday evening's episode of TNT's Snowpiercer left the tracks — literally — as we followed the perilous attempt by Jennifer Connelly's Melanie Cavill to track weather balloons at a research station as the titular train carried on its journey. While the show featured appearances from Sean Bean's Mr. Wilford, Rowan Blanchard's Alexandra Cavill, and several rats, the show was essentially a showcase for the A Beautiful Mind actress. "I thought it was a fun opportunity to spend more time with Melanie," Connelly told EW of the episode. "She's been on this journey back to herself, and back to her original purpose, that's happened over the course of the first season, and has moved along in the second season. She's out there, off the train, trying to fulfill her mission. I think it's really exciting for her, and frightening, and the stakes are super high, and it was a very different kind of episode. I had a great time doing it."