The second season completes the drama series, where Ulrich took a real chance. On the other hand, children return to the cave with the time machine in order to complete some things and Jonas learns of a real loophole that may change the future completely. At that moment, Jonas travels to 2019 to learn more, and there is the Nilsson anniversary party, during which Ulrich enters with Hannah.
The second season of Dark takes the great foundation built by its first and escalates the stakes, the emotion, and the goodwill built up. It's a hugely successful effort, proving itself as one of Netflix's absolute best in their line-ups.
"Dark" is a rewarding investment in time spent in untangling the family trees and timelines. It's also an intriguing experiment in how looped events and themes of determinism can play into growth and evolution.