Arthur and his friends commemorate their 100th episode in show-stopping style! Mr. Ratburn' s class is chosen to stage a musical tribute to Elwood City for its centennial celebration... which quickly becomes a drama of missed cues, inflated egos, and alien invasions. And that's just behind the curtain! Stay tuned to see the real, human Larry King interviewing the animated Elwood City gang between parts I and II.
| Name | Type | Role | |
|---|---|---|---|
| Michelle Kwan | Guest Star | ||
| Art Garfunkle | Guest Star | ||
| Larry King | Guest Star | ||
| Fred Rogers | Guest Star | ||
| Alex Trebek | Guest Star |