Season 2: Initially, Adam (Dietrick Hollinderbäumer) is an enigmatic figure who we know little about other than the fact he is the leader of Sic Mundus, a cult-like organisation of which Noah is a part. As the season progresses, it is revealed that Adam's group, who refer to themselves as "the travelers," has waged a war on time and Adam is responsible for everything that has happened and continues to happen in the time loop. Then, in what is probably the most shocking twist of the series, we find out that Adam is actually a much older Jonas, disfigured from his constant traveling back and forth through time. He spends almost the entire season living at the Sic Mundus headquarters in 1921, but ends the episode in 2020 to ensure teenage Jonas is unable to close the time loop by killing Martha.
- Adam's World: Adam spends most of his time slotting pieces together, ensuring that the loops continue. He shares with each character that ends up doing his bidding — mainly Silja, Agnes, Charlotte, Elisabeth, Magnus, and Franziska — that he wants to prevent Eva from getting her way in order to ultimately destroy the loops. Adam triggers the apocalypse in Eva's world at the power plant — thinks he kills Martha and "the origin" in the process — and expects himself to disappear, saved somehow from the infinite loops . . . until Claudia tells him how to break the loops for good. He sends Jonas back to get alternate Martha so that they can do so.
- Eva's World: In the final episode, Adam visits Eva in her world. She's expecting to be killed by him, as she knows has happened an infinite number of times in the loop, but instead, he tells her how he discovered he can break the loop once and for all thanks to Claudia. As Jonas and Martha save the world, Adam and Eva fade away together.
- Origin World: Jonas doesn't exist in the origin world, thus he can never give life to his alter-ego, Adam.