You may be looking for Doctor Who or SJA novelisations.

A novelisation was a book based upon a script in another medium, such as film. When the Tenth Doctor was trying to explain the mechanics of the infinite temporal flux to Martha, he suggested that it was like Back to the Future. Incredulous, she could only respond, "The film?" He then sarcastically replied, "No, the novelisation. Yes, the film." (TV: The Shakespeare Code)

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