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"The movie was created based on true event."

Do we need any preposition before "based on"?

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sabrynazulkyflyyyDo we need any preposition before "based on"?

No, but you need a determiner after it.

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Mister Micawber
sabrynazulkyflyyyDo we need any preposition before "based on"?

No, but you need a determiner after it.

Why not?
sabrynazulkyflyyyWhy not?

Why so?

I don't know,I just thought that there was supposed to be a preposition?I mean "base on" is a phrasal verb right?
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I don't think it is, but phrasal verbs are not preceded by prepositions anyway.