This bright, wholesome young performer won the coveted role of Danny Madigan, the 11-year-old protagonist of the spectacular Arnold Schwarzenegger box-office flop, "The Last Action Hero" (1993). O'Brien entered show business as a model and actor, appearing in over 40 TV commercials and magazine ads. He made his feature debut in the Stephen King-inspired sci-fi thriller, "The Lawnmower Man" (1992)…
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