This 1959-1963 television situation comedy series follows the lives of the Mitchell family, Henry, Alice, and their only child Dennis, an energetic, trouble-prone, mischievous, but well-meaning boy, who often tangles with his peace-and-quiet-loving neighbor George Wilson, a retired salesman, or, later, with George's brother John, a writer. Dennis is basically a good, well-intentioned boy who always tries to help people, but who winds up making situations worse – often at Mr. Wilson's expense.
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Jay North
Dennis Mitchell (146 episodes)

Gloria Henry
Alice Mitchell (146 episodes)

Herbert Anderson
Henry Mitchell (146 episodes)

Joseph Kearns
George Wilson (108 episodes)

Sylvia Field
Martha Wilson (108 episodes)

Gale Gordon
John Wilson (38 episodes)

George Cisar
Sgt. Theodore Mooney (31 episodes)

Irene Tedrow
Lucy Elkins (17 episodes)

Willard Waterman
Otis Quigley (10 episodes)