Jerry Mathers and Barbara Billingsley were both in the pilot, however, Ward Cleaver was played by Casey Adams and Wally was played by Paul Sullivan. The pilot episode of Leave It To Beaver was lost for many years but was found in 1987. The reason stated for giving Theodore the nickname, 'Beaver' was that when Wally was learning to speak, he couldn't pronounce Theodore. The first was located at 485 Mapleton Drive. They owned two homes during the series' run. The Cleavers lived in the town of Mayfield and the father, Ward Cleaver, worked as an accountant. Stephen Talbot as Gilbert Bates (1959-1963).Frank Bank as Clarence 'Lumpy' Rutherford (1958-1963).

Rusty Stevens as Larry Modello (1958-1960).

Sue Randall as Miss Landers (1958-1962).

Diane Brewster as Miss Canfield (1975-1958).

Jerry Mathers as Beaver (Theodore) Cleaver.

As the years passed and Beaver got older, the stories naturally moved away from the little-boy premise until, in the final season, Beaver was about to enter his teens and Wally was ready for college. Miss Canfield and Miss Landers were Beaver's school teachers. Eddie Haskell was one of the more memorable characters, unctuous and oily to adults, but a bully to little kids. Larry, Whitey, and Gilbert (among others) were Beaver's pals, Eddie and Lumpy were Wally's buddies. The boys' parents were one of those nice, middle-class couples so often seen in this kind of program. Beaver was a typically rambunctious youth, more interested in pet frogs than in girls, but Wally, just entering his teens, was beginning to discover other things in life. Beaver Cleaver was 7 when the series began, and Wally was 12. Stories relate to the experiences of the two brothers. 211 Pine Street, Mayfield, the residence of the Cleaver family: Ward, an accountant his wife June and their children, Wally and Theodore (Beaver).

Leave it to beaver cast