Buster's class at Lakewood Elementary has pen pals in Encinitas, California and Buster is going to meet them! He takes video to send back to Elwood City and learn that the Encinitas kids have pen pals in Mexico. Together they travel to Tijuana to meet their Mexican pen pals. Buster realizes that crossing the border isn't as elaborate as he'd imagined - and that it's possible to make a pen pal chain across the world.