In "Young Sheldon" Season 6, Episode 16, Missy Cooper, feeling overshadowed by her genius twin and weary of her parents' constant fighting, steals her dad's truck and runs away with her friend Paige Swanson.  Off-screen, Raegan Revord, who plays Missy, faced a traumatic car accident but found support in her co-star Mckenna Grace, who helped her through panic attacks during filming.  Let's watch the video to see how this intense episode and real-life challenges unfolded...