at the start of the third season in 1988, with the series renaming, it was given an hour long time slot. in addition to the regular thirty-minute "real ghostbusters" episode, a half-hour "slimer" sub-series was added that included 2-3 short animated segments focusing on the character slimer. at the end of its six season run, 147 episodes had aired, including the syndicated episodes and 13 episodes of "slimer", with multiple episodes airing out of production order. the segments added several characters as friends of slimer, including the character professor norman dweeb—mad scientist accompanied by a poodle named elizabeth who wanted to capture slimer to experiment on him. the professor dweeb also made infrequent appearances in the main series. one of the ghosts from the "slimer" cartoons, the sleaze, also reappeared in "the real ghostbusters" to be captured a second time.