Season 1: See what I meant about this article being full of spoilers? The 1986 Mikkel (Daan Lennard Liebrenz) — Ulrich and Katharina's young son who goes missing — and 2019 Michael (Sebastian Rudolph) — Jonas's father and Hannah's husband who kills himself in the show's first scene — are one and the same. His fate is easily one of the more heartbreaking stories in the first season.
Season 2: If you thought Mikkel's story was tragic in the first season, it gets even more heart-wrenching in season 2. In 1986, Mikkel is unable to sleep or make friends and is potentially being given sleeping pills by his adopted mother. He also receives a visit from an aged Ulrich (who escaped the hospital) but fate intervenes once more and the father and son are separated and will both continue to remain stuck in 1986. In 2019, we learn that it wasn't Michael Kahnwald's own idea to take his own life, it what is probably one of the saddest scenes of the entire series.
Season 3:
- Adam's World: Following his attempted escape with Ulrich, Mikkel is put into protective custody with Ines. They return to their home months later.
- Eva's World: In this reality, Mikkel never goes missing. He lives with Katharina as a moody tween until his death on the day of the apocalypse in November 2020.
- Origin World: Mikkel doesn't exist in the origin world because Ulrich doesn't exist.