Although excessive screen time is often frowned upon, language experts say that watching TV in a foreign language—if done with near obsession—can help you learn the language.
Studies show that it's best to acquire a language through both active and passive learning, and watching TV in a foreign language involves both. Trying to figure out a word that a person has said would be an example of active learning, and engaging with the content while hearing the language in the background would be an example of passive learning.
First, the TV program has to be highly engaging.
Second, it's best if it has subtitles, so when you hear a new word, you can look down and find it in written form.
Third, the storyline should be predictable.