Board Thread:Wiki-Related Discussion/@comment-15736398-20141111181225/@comment-15736398-20141112004622

WorldHopper22 wrote: I think if Smash the Mirror was designed to be 2 episodes, then the second hour would have a different name. Just like the second hour of the season 3 finale was entitled There's No Place Like Home.

Dark Frontier was designed to be two episodes, but is simply split into two parts.