Skull Mountain. In 1997, a multiple looping dual track shuttle coaster called Batman & Robin: The Chiller was built but only opened for a day and encountered more technical difficulties. This coaster ended up not opening again until the spring of 1998. This coaster ran rather rough and was referred to as a "headbanger" as was Viper and to a lesser extent The Scream Machine. The Mine Train and Rolling Thunder were also rough rides by then. Also, many flat rides were removed over the years and the park was showing signs of wear and tear, as well as obsolete attractions. Premier era (1998–2005) Premier Parks purchased Six Flags from Time Warner and Boston Ventures on April 1, 1998. The following year, the new management team added a dozen flat rides to the park and declared a "war on lines". The Adventure River complex was retired but the flume ride and the Congo Rapids remained. A kiddie water play area also remained as part of a new kiddie ride area called Looney Tunes Seaport. A junior roller coaster called Blackbeard's Lost Treasure Train (now known as Harley Quinn Crazy Train) as well as a kiddie roller coaster called Road Runner Railway were also added, but the star attraction was a floorless steel multiple looping roller coaster called Medusa. No changes were made at the park in 2000, but across the property on a separate parking lot, a Waterpark named Hurricane Harbor was built and opened at the end of May. This was also separately gated and charges a separate admission from Great Adventure. The park consists of a dozen waterslides, a kiddie water play area, and a wavepool. In 2001, the park added another state of the art roller coaster called Nitro. In 2002, Batman & Robin: The Chiller was renovated and new trains without over the shoulder harnesses were added making it a much smoother ride. In 2003, Superman: Ultimate Flight was added. Exact models of this are found at Six Flags Over Georgia and Six Flags Great America. In 2004, new harnesses were added to the Runaway Mine Train and the up-charge attraction erUPtion was added to the Boardwalk. In 2005, the park added the world's tallest coaster called Kingda Ka and also dismantled Viper. With the addition of Kingda Ka, the season pass holders entrance to the park was closed because Kingda Ka's footprint went right over