S1·E4 Town Without Pity

The episode begins in a religious driven small village. a church service has just ended, and a man makes a run for the woods. He finds a bridge in the woods and begins to cross it, as he crosses the bridge he gets stopped by some strange invisible force. On the bridge a Reverend approaches him, places his hand on the man's forehead, which kills him. (Obviously, people are not allowed to leave the village).

At the Legacy House, Nick comes in the conference room and tells Derek that he has uncovered some information on a lost colony from 50 years ago. Nick wants to investigate what happened to it. Derek persuades Nick to take Rachel along. We find that Rachel has had some kind of mid-life breakdown, she can't seem to handle and understand what she has witnessed in the last several weeks. She reluctantly agrees to go with him.

Nick and Rachel approach the bridge which the man at the start of the episode, died on. They cross the bridge and enter some kind of portal.