LOS ANGELES (May 1) - Hollywood studios are counting on actor Robert Downey Jr. and his big-screen incarnation as “Iron Man” to blast them out of a box office slump as the lucrative summer movie season opens this weekend.

The latest Marvel comics adventure is expected to gross $60 million to $80 million or more during its initial Friday-through-Sunday run in North American theaters, experts said, buoyed by heavy promotion and largely favorable reviews.

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