Attention: Due to the results of a recent network test marketing session, Wonder Showzen has been slightly retooled. Today's Wonder Showzen has been replaced by a full episode of Horse Apples!
| Name | Type | Role | |
|---|---|---|---|
| Charles Russell Drew | Guest Star | ||
| Barbara Ann Davidson | Guest Star | ||
| Will Ordham | Guest Star | ||
| Darlene Violette | Guest Star | ||
| David Cross | Guest Star | ||
| Jen Araki | Guest Star | ||
| Michael Birch | Guest Star | ||
| Todd Barry | Guest Star | ||
| Alex Kilgore | Guest Star | ||
| Zach Galifianakis | Guest Star | ||
| Judah Friedlander | Guest Star | ||
| Heather Lawless | Guest Star | ||
| Ptolemy Slocum | Guest Star | ||
| Jon Glaser | Guest Star | ||
| KC Roemer | Guest Star |