

In 1998, the park's name changed again, this time to "The New Marine World Theme Park ". The number of amusement rides increased over the next few years, including the addition of several major roller coasters. The theater played the Iwerks film called Dino Island for its first season of operation (the theater has since changed films numerous times). DinoSphere was an Iwerks Turbo Theater, capable of seating 100 riders per showing. DinoSphere took the place of the park's Australian Walk-A-Bout attraction (also the former home of the "DINOSAURS!" attraction). Popeye's Seaport offered eleven children's attractions, including an interactive foam ball play structure and an interactive water play area. In 1997, the park added two major ride attractions, "Popeye's Seaport" and "DinoSphere". Premier added some non-animal attractions, particularly amusement rides, to increase attendance.
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The City of Vallejo then hired Premier Parks to manage the park, upgrade it, and improve its attendance. The park defaulted on its debt to the city of Vallejo, and became owned by the city in 1996.

The park began using the comic strip character Garfield as a mascot at various points. The new Marine World opened to visitors in 1986, and remained under control of the non-profit Marine World Foundation. Following an intensive search for a new site, construction began on a new and larger park facility in Vallejo, California, about 55 miles (89 km) north from Redwood City. In late 1985, the increase in value of the property the park occupied became too great of a tax burden. In the mid-1970s, they merged with a failing land-animal park and became Marine World Africa USA. The park first opened in 1968 as Marine World, a small oceanarium in Redwood City, California.
