South Park season finale features Taylor Swift, Iggy Azalea, an Elvis hologram and...Bill Cosby

The creators of the cartoon certainly know how to keep relevant and controversial

South Park season finale.

The creators of South Park, Trey Parker and Matt Stone, have never been ones to shy away from controversy or celebrity-mocking.

Yet perhaps the pair feel they have lost some of their edge given that their degrading depiction of Kim Jong-Il in Team America: World Police did not illicit the same reaction as the current furore over The Interview.

Thus, come this season's South Park finale, Parker and Stone have left no stone unturned, having already featured a fight between Iggy Azalea and Lorde (who is alleged to be the alter ego of Stand's dad) in last week's first part of the episode.

In the final episode of the season, Kyle rallies against families spending too much time on social media over the festive period and starts a campaign called #SavetheLivingRoom to encourage traditional family values.

That's when it gets interesting, and controversial: Bill Cosby lends a helping hand.

In a clip from the episode below, Cosby appears in a celebrity special to help Kyle's campaign. Taylor Swift is seen singing "Baby, It's Cold Outside" as she tries to leave Cosby's living room. However, the comedian tries to make the singer stay with him.

Referencing recent allegations made about the American comedian, Swift, who is holding a wine glass, asks, "What's in this drink?" Cosby replies: "That's just some J-E-L-L-O."

The family watching the programme at home exclaim, "This is the oddest holiday special I've ever seen".

Another clip shows Iggy Azalea once more, this time with a melting singing snowman on her backside, as she sings a duet with a hologram of Elvis Presley.

Other celebrities not spared by South Park who appear in the finale include: Al Pacino, Miley Cyrus, U2, Angelina Jolie, and holograms of Kurt Cobain, Robin Williams and Michael Jackson, the latter playing Peter Pan, the boy who never grew up.

South Park is on Comedy Central tonight at 10pm