He found Buttercup in the street. Thinking she looked like a "tough dog", he decided to take her for his own. When Miffy and Tiffy protested, saying they saw her first, he used his bike to splatter them with mud.
Henry then took Buttercup to a small fort, and tried to force her to cross a dangerous bridge. Izzy arrived on the scene and saved Buttercup. Izzy's mother then admonished him for using Izzy's fort without permission, threatening to tell his mother. Bursting into tears, Henry apologised, and begged her not to tell his mother, before leaving the scene.