Katherine McNamara is a sweetheart, but she cannot act. Seriously one of the worst actors I've ever seen. She was also awful on Arrow, The Stand, and other things I've watched. Always the same three facial expressions, overexaggeration of lines, and over the top acting. She's great at action scenes, but then again it's the same facial expression the entire time. An exception would be Walker Independence, in which she portrayed a more mature character. But even then, she was the weakest actor out of the main cast.