10 Movies That Completely Switched Genre Halfway Through

10. Hancock

On paper, Hancock had the potential to be a phenomenal deconstruction of the superhero genre, with the focus placed on an all-powerful being who by all intents and purposes was a total pr*ck.

Unfortunately, this was during the time when star Will Smith was steadfast in his refusal to deviate from his established screen persona during the summer months, so despite a hugely promising first act the movie soon devolves into the standard tropes we've seen a thousand times before.

Hancock makes the switch from exploring what forces a superhero into becoming an alcoholic layabout with no interest in saving the day to a formulaic tale of two characters with the same powers using them in a third-act showdown heavy on visual effects. The tonal change was clearly a studio-mandated one, and it sinks the whole movie as a result.