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Gretchen the poodle is the beloved pet of young Claudia Tiedemann. While walking in the forest in 1953, the dog suddenly disappears near the caves and Claudia is left absolutely devastated.

Thirty-three years later, Claudia finds a poodle in the cave beneath the nuclear power plant. The dog seems to recognize her immediately. Could it be Gretchen?

Spoiler alert

Season 2 : episode 2

The poodle is key

Claudia later discovers that her older self carried the poodle 33 years forward in time. The reunion with Gretchen is a decisive impetus for Claudia to consider whether time travel is possible.