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Dapo began acting in 1959 at the age of seven when he played Billy Lacy in John Bromfield's syndicated series ''U.S. Marshal''. That same year he appeared as Ronnie in ''The Alcoa Hour'' in the episode "Another Day, Another Dollar" and in "The Greenhorn Story" of [[NBC]]'s western series ''Wagon Train'' starring Ward Bond. He also appeared in the movie ''-30-'' as Billy, opposite Jack Webb and Whitney Blake as their soon  be adopted son.  Then in 1960, he appeared as a schoolboy in the episode "A Bullet for the Teacher" on ABC's ''Maverick,'' starring James Garner.<ref name=imdb/>

Dapo began acting in 1959 at the age of seven when he played Billy Lacy in John Bromfield's syndicated series ''U.S. Marshal''. That same year he appeared as Ronnie in ''The Alcoa Hour'' in the episode "Another Day, Another Dollar" and in "The Greenhorn Story" of [[NBC]]'s western series ''Wagon Train'' starring Ward Bond. He also appeared in the movie ''-30-'' as Billy, opposite Jack Webb and Whitney Blake as their soon  be adopted son.  Then in 1960, he appeared as a schoolboy in the episode "A Bullet for the Teacher" on ABC's ''Maverick,'' starring James Garner.<ref name=imdb/>

In 1961, he guest starred in three ABC/WB series, ''The Roaring 20s'' (episode "Dance Marathon"), ''Hawaiian Eye'' (as Roger in "Don't Kiss Me Good-bye"), and ''Surfside 6'' (as Little Kelly in "Little Mister Kelly"). In 1962, he appeared as Norbert Smith in Meredith Willson's  film, ''The Music Man,'' and on two ABC series, as Mike Russo in the episode "Pandora's Box" of ''The Detectives Starring Robert Taylor'' and as ten-year-old Roy Barrington in "One Way Ticket" on Clint Walker's ''Cheyenne]],''  with Philip Carey cast as the outlaw Cole Younge].<ref name=imdb/>

In 1961, he guest starred in three ABC/WB series, ''The Roaring 20s'' (episode "Dance Marathon"), ''Hawaiian Eye'' (as Roger in "Don't Kiss Me Good-bye"), and ''Surfside 6'' (as Little Kelly in "Little Mister Kelly"). In 1962, he appeared as Norbert Smith in Meredith Willson's  film, ''The Music Man,'' and on two ABC series, as Mike Russo in the episode "Pandora's Box" of ''The Detectives Starring Robert Taylor'' and as ten-year-old Roy Barrington in "One Way Ticket" on Clint Walker's ''Cheyenne,''  with Philip Carey cast as the outlaw Cole Younger.<ref name=imdb/>

In 1962, he was also cast as 9-year-old Flip Rose, one of the four children (two natural and two foster) of George and Anna Rose, portrayed by Andrew Duggan and Peggy McCay, in the 26-week ''Room for One More.''<ref>Alex McNeil, ''Total Television,'' ([[New York City]]: Penguin Books, 1996), 4th ed., p. 706.</ref>  While on ''Room for One More'' young Dapo made two appearances on another ABC series, ''[he Adventures of Ozzie and Harriet'', having played himself in "The Tigers Go to a Dance" and "Rick Sends a Picture".<ref name=imdb>{{cite web|url=http://www.imdb.com/name/nm0200850/|title=''Ronnie Dapo''|publisher=Internet Movie Data Base|accessdate=January 1, 2021}}</ref>

In 1962, he was also cast as 9-year-old Flip Rose, one of the four children (two natural and two foster) of George and Anna Rose, portrayed by Andrew Duggan and Peggy McCay, in the 26-week ''Room for One More.''<ref>Alex McNeil, ''Total Television,'' ([[New York City]]: Penguin Books, 1996), 4th ed., p. 706.</ref>  While on ''Room for One More'' young Dapo made two appearances on another ABC series, ''The Adventures of Ozzie and Harriet,'' having played himself in "The Tigers Go to a Dance" and "Rick Sends a Picture".<ref name=imdb>{{cite web|url=http://www.imdb.com/name/nm0200850/|title=''Ronnie Dapo''|publisher=Internet Movie Data Base|accessdate=January 1, 2021}}</ref>

   

   

In 1963, he guest starred as Danny Saunders in "The Left Field Caper" of ABC's  ''77 Sunset Strip''<ref name=imdb/> before he was cast as Phil Silvers' [[nephew]], Andy, in Silvers' revised sitcom. The second Silvers series focused on the star's role of Harry Grafton as the foreman of a plant, with co-stars  Stafford Repp, Herbie Faye, and Buddy Lester. Then Elena Verdugo joined the show as Andy's mother, Audrey, and Sandy Descher as Andy's older sister, Susan. Like ''Room for One More,''  ''The New Phil Silvers Show'' soon folded.<ref>McNeil, ''Total Television,''  p. 598.</ref>

In 1963, he guest starred as Danny Saunders in "The Left Field Caper" of ABC's  ''77 Sunset Strip''<ref name=imdb/> before he was cast as Phil Silvers' [[nephew]], Andy, in Silvers' revised sitcom. The second Silvers series focused on the star's role of Harry Grafton as the foreman of a plant, with co-stars  Stafford Repp, Herbie Faye, and Buddy Lester. Then Elena Verdugo joined the show as Andy's mother, Audrey, and Sandy Descher as Andy's older sister, Susan. Like ''Room for One More,''  ''The New Phil Silvers Show'' soon folded.<ref>McNeil, ''Total Television,''  p. 598.</ref>