потерять всякую оригинальность, скатившись в абсурд
The show really jumped the shark when the main character was replaced by a robot.
Шоу действительно потеряло всякую оригинальность, когда главного героя заменили роботом.
Definitions
To 'jump the shark' means to reach a point at which something (such as a TV show, series, or creative endeavor) begins to decline in quality, originality, or relevance, often due to a gimmick or over-the-top event intended to maintain interest. The phrase originates from a notorious episode of the TV show 'Happy Days' in which a character literally jumps over a shark on water-skis.