In 1986, Mikkel is visited in the hospital by a priest Noah who talks to him and asks about his health.

After having discovered Ulrich and Katharina's affair, Hannah falsely tells the police that she saw Ulrich rape Katharina, and Ulrich is arrested.

 At the hotel, the Stranger tells Regina to deliver a package to Jonas while he is away for a few days.

At Michael's grave, the Stranger approaches Jonas, telling him that his father once saved his life. 

Bartosz meets Erik Obendorf's drug supplier, who is also Noah.  And give him a lift and talk in detail.

Later, Jonas receives the Stranger's package, containing a light, a Geiger counter, and Michael's suicide letter.

In the letter Jonas' father explains that on 4 November 2019, he travelled back to 1986. After that he keep the letter with him.

There he stayed and grew up, raised by Ines, eventually marrying Hannah and fathering Jonas. Thus Mikkel Nielsen became Michael Kahnwald.