Casey Kasem made two guest appearances on Saved by the Bell during the "original class" years (1989-93). One had him narrating an episode in which the gang had formed a rock group, Zack Attack. The other has him MC'ing a dance contest at the gang's hangout, The Max.
Here, in this excerpt, Screech (Dustin Diamond) & Lisa (Lark Voorhies) improvise a new dance after Lisa suffers a sprained ankle and has to use crutches. Enter "The Sprain":
Unfortunately, the other episode, "Rockumentary", is not available on YouTube. Yet.
Rating for this episode: B.