Jump the shark.
[Idiom] JUMP THE SHARK. - Uncover Phrases for Decline After Success in English!
Declining in quality after a peak.
To "jump the shark" is to say something that was once widely popular has reached a peak and begun a steady decline in quality, especially in a way that is irretrievable and apparent to all. Originally from TV shows that include absurd scenarios to maintain viewer interest, it's now used more broadly to describe any effort that goes overboard to maintain relevance but ends up failing.
Example Sentences
The TV show seemed to jump the shark when they introduced time travel.
The TV show's quality declined noticeably when they introduced time travel, suggesting they were trying too hard to keep the audience interested.
Once the series jumped the shark, many viewers stopped watching.
After the series made an outrageous change, many people stopped watching the show because they didn't like the new direction.
The moment the main character became a superhero, it was clear that the show had jumped the make the shark.
When the main character was suddenly turned into a superhero, it was clear the show had become unrealistic and lost its original charm.