Among all 117 episodes of the show, all six characters were in 112 of the 117 episodes. Three people, two actors and one actress, acted in every episode, they were Christopher Hewett, as Mr. Lynn Aloysius Belvedere, Ilene Graff as Marsha Owens, and Brice Beckham as youngest sibling, Wesley T. Owens. The three missing from five episodes combined are Bob Uecker acted as George Owens, Rob Stone acted as Kevin Owens, and Tracy Wells acted as Heather Owens. Bob Uecker did not act in two episodes, Mr. Belvedere: The Escort (1989) and Mr. Belvedere: The Dinner (1989). Rob Stone also did not act in two episodes, Mr. Belvedere: Hooky (1988) and Mr. Belvedere: Mr. Belvedere's Wedding: Part 1 (1990). Extra fact, Rob Stone co-directed Mr. Belvedere's Wedding Part 1. The only episode that Tracy Wells did not act in was Mr. Belvedere: Jobless (1987).