Dio appeared in the Season Three episode, "Hooked on Monkey Fonics", where they were seen playing one of their most well known hit songs, "Holy Diver", at South Park Elementary's Bay of Pigs Memorial Dance. The Fonics Monkey also joined them on drums.
In a 2002 interview for Reality Check TV, when asked about his parodied appearance in South Park, Ronnie James described it as being "wonderful". He commented that he initially didn't want to let it be done because he felt that they were just gonna "crucify" him, although the producers ended up convincing him that they were fans of his music and that he would like it, so he ultimately accepted.
He showed some reservations about how they portrayed his talking voice, though (which in the episode, following the usual South Park trend, is comically high-pitched). When asked if the producers had approached him to lend his own voice for his animated version, he responded that they didn't and that he wouldn't have done it, anyway. He then confirmed that they had indeed obtained the rights to play their hit song "Holy Diver" in the episode.
- Even though the band was still active at the time of this episode, the members likenesses do not match the band's line-up at the time.