 Complete the following phrase:  In the early 1970s, Six Flags began augmenting its supply of costumed characters with creations from various Sid  Marty Krofft television series. Characters from H. R. Pufnstuf began appearing in the park in 1970, with characters from Lidsville added in 1972. The 1970 production in the Krofft Puppet Theater was based on H. R. Pufnstuf, as well. These characters left the park after the 1974 season as Krofft decided to open its own amusement park, The World of Sid and Marty Krofft, in downtown Atlanta. In Lickskillet, the Drunken Barrels flat ride had replaced the Wheel Burrow, and in 1972 Six Flags debuted the fully-restored Riverview Carousel on a hilltop adjacent to the section. This carousel, purchased from the defunct 