Man of Steel Director Zack Snyder (Watchmen, Dawn of the Dead) begins with Superman's birth on Krypton. As the last hope for his people's survival, his parents send him to Earth to escape an insurrection by General Zod, played by Boardwalk Empire actor Michael Shannon.
With the action brought by Dark Knight producer Christopher Nolan, Warner Bros is hoping it can re-launch a new series of Superman films after Superman Returns in 2006 failed to live up to box office expectations.
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The twins cubs, which were born in June, have been named Bert and Ernie after characters from Sesame Street.
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