Jonas meets an ominous figure. While the kids comb the cave for answers, the adults gather in the bunker to share what they know about the travelers.
Tropes:
- Affably Evil: Adam exudes genuine well meaningness while interacting with Adult Noah and Jonas.
- Agent Scully: Katharina doesn't believe anything said to her in the bunker, stating everyone has lost their minds. She changes her mind after seeing Mikkel as Michael Kahnwald in 1987.
- Call-Back: Noah's speech to Helge about a stranger sleeping at his house when he was young is actually Jonas arriving at 1921.
- Cassandra Truth: Katharina naturally assumes her peers and Stranger!Jonas have gone insane when they reveal Mikkel and Ulrich got stuck in the past, as she doesn't know about Time Travel yet.
- Catapult Nightmare: Now it is Martha who wakes up like this after she dreams of sleeping with Jonas.
- Cooperation Gambit: Franziska and Magnus enter into one to discover what went wrong in the caves.
- Crisis of Faith: Silja has one when she discovers the God Particle's true nature.
- Distinguishing Mark: Adam shows Jonas (and us) that he's indeed his future self by showing the neck wound Elisabeth inflicted on them in 2053.
- Foreshadowing: Stranger Jonas tells the adults Adam told him about a loophole in time travel, which is going to be used by Jonas soon...
- Get Back to the Future: In 1921, Jonas attempts to travel back to his time but discovers that the pathway in the cave hasn't been created yet.
- Heroic BSoD: Jonas undergoes a small one when he realized he's off from his actual destination by 99 years.
- History Repeats: Bartosz is tied in the caves and left alone by Martha and Magnus as their parents did with Bartosz's mother.
- Noah dissuades a member of the Nielsen family from time-traveling again while eating an apple and waiting for them at the caves.
- Hopeless with Tech: Claudia in 2020, though justified that she is unaware of all the changes.
- I Did What I Had to Do: Hannah justifies her keeping blackmail material as a financial and social security.
- I'll Kill You!: Magnus tells Bartosz that he will kill him if he has anything to do with Mikkel and Ulrich's disappearance.
- Internal Reveal:
- Charlotte, Katharina, Peter and Hannah now all know about the travelers.
- Jonas reveals to Katharina that he is Mikkel's son and her grandson. She doesn't believe any of it at first until she finds a photo of Michael Kahnwald at the school showing her Mikkel.
- Kid from the Future: Jonas meets his great-great-grandmother Agnes as a child herself, but obviously neither know it.
- My Future Self and Me: Jonas meets himself as an elder man.
- No-Holds-Barred Beatdown: Magnus delivers one to Bartosz when he's suspected of the disappearances.
- Only Sane Man: Elisabeth is the only one who objects to going to the caves suspected of multiple disappearances.
- The Reveal: Adam is actually an elder Jonas.
-
Technology Marches On - Time Is Dangerous: Adam tells his younger self that he is as he is now due to carelessly time traveling in his history.
- Title Drop: Jonas tells Charlotte that people traveling in time are called the travelers and are part of "Sic Mundus".
- Wham Episode: Adam is none other than an elderly Jonas, as he attributes his disfigurement to his continuous time-traveling.
- On a lesser note, the adults now know about time travel.
- Wham Line: 'I am you', said by Adam to Jonas.
- What Does She See in Him?: According to Wöller, nobody really understood why Hannah married Michael, since she was beautiful enough to have anybody she wanted.
- Wham Shot: Adam proves to Jonas that he is him by showing the scar on his neck when Elisabeth attempted to hang him.
- What the Hell, Hero?: Jonas berates his mother when he finds a gun and blackmail material, as she responds she kept them for insurance.
- What Year Is It?: When Jonas accidentally ends up in 1921, he asks the people who helped him what year it is. He clearly isn't happy with the answer.
