Lumpy and a few friends were hanging out when they saw a bright flash. Turns out they were transported to the past with the rest of their hometown, Marshville.
Lumpy started out as a wimp. The kid all the other kids made fun of and picked on. After meeting his cousin, Meriem, and learning her story he began to change. Although still terrified of the dinosaurs as well as Klyde he has proven he'd sacrifice himself to save his cousin.