<Li> Theodore "Beaver" Cleaver (Jerry Mathers) is the younger son of Ward and June Cleaver and Wally's brother . When the show opens, Beaver is seven years old ("almost eight") and in the second grade at Grant Ave . Grammar School . Beaver is all - boy with baseball, carnivals, comic books, money - making schemes, and animals of all kinds high on his list of interests while very proper ladies, dance lessons, bathing, and homework test his patience to the limit . Through the series' entire six - season run, Beaver shares a bedroom and adjoining bath with Wally . In one episode, he moves into the guest room after a spat with Wally but returns to the safety of his old bedroom when shadows in the guest room spook him . Beaver is not the athlete his brother is, but he does play football and wins his school team's Most Inspirational Player award . He also performs in many school plays . Beaver has several one - shot pets (an alligator, a rabbit, pigeons, and other creatures) through the series' run . Though Beaver has many friends his own age, his best friend is Gus, an old fireman in the neighborhood, who gives Beaver sound advice and tries to keep the boy on the straight and narrow . Beaver wants and tries to do the right thing but cannot help going astray and usually faces a moral lecture from his father at the end of each episode regarding some misadventure he has suffered or mistake he has made . Actor Jerry Mathers played the role in the pilot and the show's spin - offs . </Li> <P> Beaver's best pals include apple - munching Larry Mondello (Rusty Stevens, November 22, 1957--June 6, 1960), Gilbert Bates (Stephen Talbot, March 19, 1959--June 6, 1963), Hubert "Whitey" Whitney (Stanley Fafara, October 4, 1957--June 6, 1963), and the old fireman, Gus (Burt Mustin, October 4, 1957--February 24, 1962). Except for Gus, Beaver's friends steer him into trouble time and again . Other friends include Harry Henderson (Keith Taylor), a chubby, bespectacled boy brought in after Rusty Stevens' departure, and Richard Rickover (Richard Correll, April 30, 1960--October 18, 1962). </P> <P> Judy Hensler (Jeri Weil, October 4, 1957--October 15, 1960) is Beaver's snitching, goody - goody classroom nemesis on the show . Penny Woods (Karen Sue Trent, February 20, 1960--January 20, 1962) filled the nemesis role when Judy was dropped . Other friends include Lumpy's sister Violet Rutherford, (Wendy Winkleman, 1957 and Veronica Cartwright, February 19, 1959--May 2, 1963). Benjie Bellamy (Joey Scott) and Chuckie Murdock (Rory Stevens) are both small boys and Cleaver neighbors who cause trouble . Beaver's notorious classmate Angela Valentine is an unseen character, mentioned a dozen times in the series but never shown on screen . </P> <P> Beaver had two female teachers in the earliest seasons . Miss Canfield (Diane Brewster, October 4, 1957--March 21, 1958) is Beaver's kind and understanding second grade teacher at Grant Ave . Grammar School and appears in four first - season episodes . Beaver has a crush on her in one episode . Alice Landers (Sue Randall, October 16, 1958--February 17, 1962) becomes Beaver's third grade teacher in the second season, replacing Miss Canfield . She remains his teacher for several seasons . Beaver develops a crush on her but his joy turns sour when she announces her engagement to Tom Brittingham . Cornelia Rayburn (Doris Packer, October 4, 1957--June 13, 1963) is the principal of Grant Ave . Grammar School and, later Beaver's teacher, after Miss Landers, replacing Mr. Bloomgarten . In the later seasons, Beaver has male, rather than female, teachers who include Mr. Willet and Mr. Blair, both played by Wendell Holmes . </P>

Who played benji on leave it to beaver