Season 1: Married to Charlotte and the father of Franziska and Elisabeth, Peter is also a therapist in Winden, and is counselling Jonas in the months following his father Michael's death. Peter and Charlotte's relationship is strained, and we learn that at least part of the reason is due to Benni, a sex worker whom Peter had a past relationship with. Peter drives to see Benni on the night Mikkel disappears, but turns around and drives to his father's bunker, where he is when Ulrich's brother Mads's body falls from a portal.
Season 2: Once older Jonas reveals his identity to Hannah and Charlotte, Peter reveals that he was aware of time travel because of old Claudia, who told him and Tronte what to do to keep the time loops preserved after finding Mads's body. Peter ends the season in the bunker with Elisabeth as the apocalypse occurs.
Season 3:
- Adam's World: In Adam's world we see Peter come to Winden as a teenager in 1987 to live with his dad, where he meets Charlotte along the way. In the post-apocalyptic future, Peter brings Elisabeth every day to look at those residents who have been found dead, in an effort to find out what happened to Charlotte and Franziska. Peter meets his untimely end when he pulls a man attempting to rape Elisabeth off of her, and gets stabbed in the neck with a knife.
- Eva's World: In this reality, Peter is a clergy member at the local church, but is still married to Charlotte. It's implied, however, that a relationship with Benni is going on, as they are seen in the church together.
- Origin World: In the origin world, Peter moves to Winden but is never able to meet Charlotte, as she doesn't exist. In the dinner table scene with Hannah, Katharina, and Regina, Peter appears to be in a relationship with Benni.