This episode is interesting in that it's not the Time Team going back in time, but having to track down someone they brought back from the past. The added stress of Wyatt's undead wife living in the bunker is apparent and we see why Lucy Preston is one of the best female characters ever written. She's selfless, she's kind and she's not afraid to defend the people she loves. Even though she's in an unintended love triangle she is all grace and deference.