In S2 Ep4, of Dark, The Travelers, Jonas wakes up in 1921 and meets both younger and older versions of characters he’s seen before. We discover that Sic Mundus really is part of the Underworld and Agnes was always a fashion maven. In the 21st century, the secret of time travel finally comes out.
Some well deserved justice is served up on Bartosz, who’s known the secret of the caves since a few days after Mikkel disappeared, but kept it to himself, among his other, smaller, betrayals.
Katharina is also forced to confront the past. If she and Ulrich had been less harsh and more patient with Mikkel the day he arrived in 1986, could things have been different?
Everyone gets what they deserve.