I think there's a better series finale than Regular Show out there. That is the Jimmy Neutron series finale
Jimmy managed to make the greatest invention ever, got together with Cindy, graduated Elementary School, and Skeet, Sam, Bolbi, Brobot, Ultra Lord and others returned!
It was so touching when Jimmy and Cindy were officially a relationship.
I got so sad when everyone were graduating Elementary School and saying goodbye to Ms. Fowl
Jimmy Neutron left me wanting more..........and then we got the crapfest that is Planet Sheen. It should have been called Planet Hugh