Louise Dalton is a semi-retired plumber on Earth, appearing for the first time in Ben 10: Race Against Time. Mrs. Dalton is the owner of the restaurant where Ben goes to grab a bite after school.
Mrs. Dalton appeared in the film Ben 10: Race Against Time, when Ben goes to eat at her restaurant.
Later in the film she is seen with other inhabitants of the city, revealed to be a semi-retired Plumber. She then helps fight Eon and works with Edward White for most of the fight.