Arthur the Butterfly

Arthur the Butterfly is an episode of Angelina Ballerina.

Summary
While at a picnic with her ballet class, Angelina finds a butterfly whom she names Arthur and takes it home. One day Henry accidentally lets it loose so Angelina and her friends chase after Arthur, unfortunately they fall down a hole. They are all very scared and cold as it gets dark, but thankfully Arthur brought the parents to the hole and Angelina is grateful.