a cost of around $400 million, Walt Disney World's first park the Magic Kingdom, along with Disney's Contemporary Resort and Disney's Polynesian Resort, opened on October 1, 1971, with 10,400 visitors. A parade with over 1,000 band members, 4,000 Disney entertainers, and a choir from the U.S. Army marched down Main Street. The icon of the park was the Cinderella Castle. Three months later on Thanksgiving day, cars traveling to the Magic Kingdom caused traffic jams along interstate roads. On December 21, 1971, Roy died of cerebral hemorrhage at St. Joseph Hospital. After Roy's death, Donn Tatum, a senior executive and former president of Disney, became the first non-Disney-family-member to become CEO and chairman of the board. Card Walker, who had been with the company since 1938, became its president. By June 30, 1973, Disney had over 23,000 employees and had a gross revenue of $257,751,000 over a nine-month period, compared to the year before when it made $220,026,000. In November, Disney released the animated film Robin Hood (1973), which became Disney's biggest international-grossing movie at $18 million. Throughout the 1970s, Disney released several more live-action films such as The Computer Wore Tennis Shoes sequel Now You See Him, Now You Don't; The Love Bug sequels Herbie Rides Again (1974) and Herbie Goes to Monte Carlo (1977); Escape to Witch Mountain (1975); and Freaky Friday (1976). In 1976, Card Walker became CEO of the company, with Tatum remaining as chairman until 1980, when Walker replaced him. In 1977, Roy E. Disney, Roy O. Disney's son and the only Disney working for the company, resigned from his job as an executive because of disagreements with the company's decisions. In 1977, Disney released the successful animated film The Rescuers, which grossed $48 million at the box office. The live-acton/animated musical Pete's Dragon was released in 1977, grossing $16 million in the U.S. and Canada, but was considered a disappointment to the company. In 1979, Disney's first PG-rated film and most expensive film up to that point at $26 million dollars The Black Hole was released, showing Disney could use special effects. It grossed $35 million, which was a disappointment to the company, which thought it would be a hit like Star Wars (1977). The Black Hole was a response to other Science fiction films of the era. In September, 12 animators, which was over 15 percent of the department, resigned from the