Adam was introduced to Dark season two when Jonas overshot his attempts at travelling back in time and ended up at the turn of the century. ... Adam claimed he has sustained these lesions over time due to travelling through time too much.

Why did Jonas change his name to Adam?

Some say that mid-Jonas traveled to the past, changed his name and had a new family there. There was also this theory that suggested that Adam was actually the Jonas from Martha2's universe, and that he changed places with our Jonas, which Martha2 saves from the apocalypse in the last episode.

Who really is Adam in dark?

Adam, is the son of Michael and Hannah Kahnwald. As a teenager, he is a thoughtful person whose father's suicide hits him hard, even worse after finding out his true identity. Michael Kahnwald was really Mikkel Nielsen, who traveled through time from 2019 to 1986 and grew up with adoptive mother Ines Kahnwald.