10 Movie Stars Who Ruined Their Own Movies

10. Will Smith - I, Robot

Alex Proyas' 2004 blockbuster I, Robot started out life as an original script from Jeff Vintar called Hardwired - an Agatha Christie-esque murder mystery in which an FBI agent investigates the murder of a roboticist, with the entire movie being set at the scene of the crime.

The project passed through the hands of numerous actors, including Arnold Schwarzenegger and Denzel Washington, before Will Smith finally became attached.

But with Smith's involvement, Fox began to envision the story as something much grander, and so writer Vintar was brought back to expand it into an action-blockbuster worthy of a $120 million budget.

Oscar-winning writer Akiva Goldsman (A Beautiful Mind) was also hired to polish the script for Smith, all of this ensuring that Vintar's modest original concept was basically tossed out for a broader, more schlocky sci-fi action tentpole.

Simply, Smith's involvement mutated the entire project beyond its writer's original intent, because there was no way either Fox or Smith were going to sign off on a sci-fi chamber piece.

While the end result isn't terrible, it is a bastardisation of both the original concept and also Isaac Asimov's work that inspired it, to which it ultimately bears only the vaguest resemblance.