It is kinda wild how many Doctor Who spin-offs have an episode with an evil clown.

The Sarah Jane Adventures have an evil clown 2-parter which references Steven King's IT; Sarah Jane canonically has coulrophobia, the K9 series has an episode where the villains are dressed as clowns (which also features? Wrestling, I think?, and Torchwood has an episode where they battle a carnival troupe who steal people's breath (feat. clown acrobats), which is probably the only time a clown performance has ever been referred to as breath-taking.

I'm beginning to suspect that the only reason Class wasn't renewed was because they spent their makeup budget on alien effects rather than creepy clown effects, like God intended.