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After the failure that was Superman III Alexander & Ilya Salkind went to work on a Spinoff movie based on Superman's cousin Supergirl but for the movie to work they would need Christopher Reeve to pass the Torch.
Reeve feeling typecast but getting the Directors bug goes to Warner Media & Tristar and agrees to reprise his role on the following conditions:
The Studio produce his directorial debut: Street Smarts
He has more control over his character
This will be his last time out as Superman if they make another film they can replace him