Fan Casting In Name Only in Sort by Tropes

This occurs when a derivative work (an adaptation, a remake, or a reimagining) is so different from the work it took its name from that the only thing actually tying it to the original work is the title, a few character names and, if lucky, the broad premise. It would stand perfectly as an original work if references to the source were removed. This can happen when the work was originally intended as something completely different, but, being slightly similar to an existing franchise, it is changed to fit in that franchise, or it can be straight-up title hijack.