Correct keyword for TV Series Movie

Yes, I understand that keyword applies. What I'm trying to determine is which keyword is appropriate, and more specific, when it is not just based, but more like a long-form episode, or exceptional adventure. For example, Star Trek (2009) vs Star Trek: First Contact (1996). Both are based on a TV series, but not in the same way. Would you agree the nature in which they are based on the TV series is different? I'm trying to find a proper keyword to further describe that. In Star Trek (2009) you get introduced to the characters, you need no previous knowledge of the TV shows at all. Whereas Star Trek: First Contact (1996) might be enjoyable for someone with absolutely no knowledge of any Star Trek series, if it very much more connected to TNG. Same actors, etc. With a lower budget or without such cultural presence as ST has, it could have been a "tv movie". But when that doesn't apply, what is it? What keyword sets it apart when, in a way that I lack the words to describe, in essence, it is the TV series?

Hi CarlitoGil - I'm not very well-adverse with "Star Trek", so to ensure I understand correctly, are you asking specifically what's the appropriate keyword to distinguish movies that are direct continuations of their TV series verses those that are simply based on or inspired by TV shows? For example, the 1995 "The Brady Bunch Movie" is separate from the 1969–1974 "The Brady Bunch" TV series (e.g., not a continuation) as say the recent "Downton Abbey" films, and you are trying to determine a keyword that fits outside of "Based on a TV Series", is that correct?

Not exactly, but you're making good distinctions. A "direct continuation" might use the sequel-to-tv-series keyword. The Downton Abbey films seem to have it already. The Brady Bunch Movie is tricky. It's more of a remake. I guess it stands on its own. The Simpsons TV series, which is ongoing, has the 2007 movie and another coming in 2027. They do not have "sequel-to-tv-series" keyword. Should they, even thought the series hasn't ended? If yes, then that's the answer, but I don't know if the community tags them as so. If not, then what keyword applies beyond just based-on-tv-series?

@CarlitoGil- If a film is made as a continuation of or tie-in to a TV series, the keyword "sequel to series" would be appropriate regardless of whether the TV series is ongoing or ended. So for something like "The Simpsons Movie", the keyword "sequel to series" would be appropriate even though The Simpsons TV series was (and still is) ongoing, because the movie is a theatrical extension of the TV series. Another example is that we also have "prequel-to-series" for the opposite, where a movie is made and then a TV series follows. The keyword should establish the connection between the series and the film, regardless if the series has ended or not.