A movie and a TV show are run quite differently.
In a movie, the producers are mainly there as investors into the project, and the directors are in full control of the creative process. But even then, there are examples of movies where there is someone who has creative control above directors. For example, the Marvel movies have Kevin Feige as executive producer, and he controls the creative process across the series of movies.
Single episodes of a TV show can have their own director, but that director is only responsible for the direction in that single episode. The continuous direction across all episodes is at the direction of the show runner. Things that affect multiple episodes, such as character traits/evolution, are going to be at the discretion of the showrunner.
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