What started out as a long-shot, or just a gag filler show for Comedy Central in 1997, "South Park" has now become an 18-season stronghold for the cable network alongside their mighty "The Daily Show with Jon Stewart."

But now, according to a report on Deadline, the show has reached another deal with the cable broadcast giant to keep it on the air for another three seasons, which will bring its tally up to 21 seasons.

The flagship show has undergone many incarnations over the decades and was originally conceived by creators Matt Stone and Trey Parker. Several voice characters have come and gone on the show, which include Mary Kay Bergman, Isaac Hayes, Eliza Schneider, Mona Marshall and April Stewart.

One thing that has remained on "South Park," though, is the show's four main characters: tan, Kyle, Eric (Cartman) and Kenny. Of course you wouldn't forget about the Chef. The four boys have remained the same age throughout the series and their exploits play to the summit of the show's comedy, which has been hailed by many as legendary.

It has taken an approach that is similar to that of Fox's "The Simpsons," which predates the show by a decade and is also still on the air. The approach is that it is an animated show that is geared for the humor that reaches out for an adult, mature audience.

Deadline also states that the new deal has essentially been an order for 30 more episodes. That will bring its episode number up to 304 total and will also serve as the longest running show on cable TV, which excludes broadcast networks like NBC, CBS, Fox, ABC and The CW.

The studio responsible for the show, South Park Digital Studios, has extended its deal with streaming platform Hulu so that they may be able to also feature the new episodes on their streaming platform as well.

Season 19 of "South Park" premieres on Comedy Central this fall on Sept. 16.