We all know that parallel universes or "mirror universe" are most popular in sci-fi shows but who would ever think it will hit a teen drama. The Episode is really interesting because of they formed the parallel universe. It was a big step for them and they did a great job mixing a bit of sci-fi with teen drama. The only reason i gave it a 4/5 is cause the could have made the episode longer it would have been better as a two parter