Back to the Past is the forty-sixth episode of the series, sixth episode in Season 2. The episode aired August 24, 2014.
Mina falls into a portal to an alternate timeline, and as the crew search for her, new allies join them on their mission.
- The future was based on BBC's Primeval's Future.
- So were some of the creatures.
- The story was rewritten. The original version was long and would confuse the readers.
- It was originally a 2 part episode.