Armed with a plan to prevent the apocalypse, Jonas travels to 2019. During the Nielsens’ anniversary party, Ulrich sneaks off with Hannah.

Martha meets the Stranger and learns his true identity. Claudia tries to prevent Egon’s death in 1987. Hannah travels to 1954 to see Ulrich.

Claudia reveals to Adam how everything is connected — and how he can destroy the knot.

Charlotte and Ulrich try to piece together what happened in the bunker. In different times and worlds, Jonas and Martha work to gain each other’s trust.

Adam holds Martha captive in 2020. On the day of the apocalypse, an increasingly frantic Martha begs Bartosz for his help.

In 1954, a missing Helge returns, but he’ll only speak to Noah. In 1987, Claudia brings the time machine to Tannhaus, and Egon questions Ulrich again.

In 2019, Jonas emerges from the cave into a strange but familiar world: the town of Winden, reeling from the recent disappearance of a young boy.

Peter gets a shock. Jonas learns the truth about his family, but there are more surprises still to come. Helge makes a sacrifice.

Bizarre occurrences give Charlotte a sense of déjà vu, and she suspects Peter is hiding something. Franziska snaps when Magnus confronts her.

Hannah takes her obsession with Ulrich too far. The stranger asks Regina to deliver an important package. Martha is torn between Jonas and Bartosz.

Ulrich looks to the past for answers and dredges up disturbing family secrets. Armed with new tools, Jonas probes the cave’s murky depths.

Ulrich questions a frail and frightened Helge in the nursing home. Jonas searches for Mikkel, but the stranger warns him about meddling with the past.

In 1953, the disfigured bodies of two boys are exhumed at a construction site, the future location of Winden’s nuclear power plant.

Ulrich runs afoul of the law, Helge tries to dodge Egon Tiedemann, Claudia harnesses the cave’s powers, and Katharina lashes out at Hannah.

In 2019, a local boy’s disappearance stokes fear in the residents of Winden, a small German town with a strange and tragic history.

When a grim discovery leaves the police baffled, Ulrich seeks a search warrant for the power plant. A mysterious stranger checks into the hotel.

It’s 1986, and Ulrich’s brother, Mads, has been missing for a month. Confusion reigns as past and present intertwine.

Buying time, Iris escapes the messy leftovers of her double life and takes time off-grid. Georges, a former client, takes Iris into his world. Reality, however, has a way of…

Having family in town brings up complicated feelings for Iris. Tawny feels bad about how things played out with The V. Afraid to face her own truth, Iris realizes she…

Iris and her co-worker start working on an AI project that mirrors human emotion. Meanwhile, new clients provided by a high-end escort agency, leave Iris with a wealth of behavioral…

Iris gets better at simulating the perfect girlfriend experience for her clients. Simultaneously at NGM, Iris and her co-workers start training the AI model with new simulated sets.

Iris’ client relationships seem increasingly uncanny, and advice from Tawny isn’t what Iris was hoping for. Her father’s illness catches up with Iris in undeniable ways.