Television's most popular comedy "Two and Half Men" will return to air this fall with actor Ashton Kutcher filling the void left by Charlie Sheen, the companies behind the show said on Friday. CBS Corp., which airs the show, and Warner Bros., the Time Warner Inc. unit that makes it, said production of the ninth season would begin this summer, with Mr. Kutcher taking a new starring role in the show. The announcement, confirming reports from Thursday night, removes a big question mark that has hovered over the hit show since Mr. Sheen was fired in early March. Both companies...