Maurice and Sydney are the major antagonist in the reboot TV series, Ben 10, who first appeared in the episode, The Filth.
Maurice and Sydney stole the Rustbucket to get all garbage in order to make the maggotnet. They made it and all maggots formed into a giant monster. Ben, who transformed into Four Arms threw the Rustbucket to the maggotnet and the monster got defeated.
Max to the Max
Maurice invented a machine that can make clones that are dumb, since their minds are more separated. He started to aim it on Ben, who appeared as Four Arms. It missed and hit grandpa Max instead and he became many and much dumber. Later Ben and Gwen pop all clones and the real Max is back.
Maurice is a scientist with a human head and a cockroach body. He is the smarter one, while his partner, Sidney is the opposite, since he has a bug head and a human body. He is less smarter than Maurice.
Maurice is the one who thinks and he takes the lead, while Sydney is the brutish type, who thinks less than his partner.