Sara Jansen Pierce

Sara Jansen Pierce has appeared on The Rock Cave so many times she's basically a co-host at this point, and Cave Nation is starting to wonder whose show this actually is. From deep-diving Rickie Lee Jones and Lionel Richie to defending Air Supply with zero apology, Sara brings the kind of musical range that keeps Mark on his toes. She even got her own birthday episode, which the rest of us are still jealous about.