The Butterfly Effect is the 31st episode of the 2013 series of Calimero.
In this episode, Calimero wants to show Priscilla a rare species of butterfly, but she's too busy hunting down a story for the school newspaper, so Calimero tries to help.
This episode can be watched here: http://www.cartooncrazy.me/watch/calimero-2014-episode-31-the-butterfly-effect/