One Shall FallBackdropTransformers: PrimePoster8.7Rated 8.7 on TMDBTransformers: PrimeOne Shall FallSeason 1, Episode 23GalleryThe Decepticons quickly try to build a space bridge before a prophesied darkness arrives.CastPeter CullenOptimus Prime (voice)Jeffrey CombsRatchet (voice)Frank WelkerMegatron (voice)