<P> Don, Kathy and Cosmo come up with the idea to turn The Duelling Cavalier into a musical called The Dancing Cavalier, complete with a modern musical number called "Broadway Melody". Cosmo, inspired by a scene in The Duelling Cavalier where Lina's voice was out of sync, suggests that they dub Lina's voice with Kathy's . R.F. approves the idea but tells them not to inform Lina about the dubbing . When Lina finds out, she is infuriated . She becomes even angrier when she discovers that R.F. intends to give Kathy a screen credit and a big publicity buildup afterward . Lina threatens to sue R.F. unless he orders Kathy to continue working uncredited as Lina's voice . R.F. reluctantly agrees to her demands, as a clause in her contract states that she can sue whenever denied a role of her choosing . </P> <P> The premiere of The Dancing Cavalier is a tremendous success . When the audience clamors for Lina to sing live, Don, Cosmo, and R.F. tell her to lip sync into the microphone while Kathy, hidden behind the curtain, sings into a second one . While Lina is "singing," Don, Cosmo and R.F. gleefully raise the curtain, revealing the fakery . Lina flees . A distressed Kathy tries to run away as well, but Don proudly announces to the audience that she's "the real star of the film ." Later, Kathy and Don kiss in front of a billboard for their new film, Singin' in the Rain . </P> <Ul> <Li> Gene Kelly as Don Lockwood . His performance in the song "Singin' in the Rain" is now considered to be iconic . </Li> <Li> Debbie Reynolds as Kathy Selden . Directors Gene Kelly and Stanley Donen insisted that Reynolds was always first in their minds for the role . Although the film revolves around the idea that Kathy has to dub over for Lina's voice, in the scene where Kathy is dubbing a line of Lina's dialogue ("Our love will last' til the stars turn cold"), Jean Hagen's normal voice is used . </Li> <Li> Donald O'Connor as Cosmo Brown, Don's lifelong pal, and vaudeville partner, who becomes the head of Monumental Pictures' music department . </Li> <Li> Jean Hagen as Lina Lamont . Fresh off her role in The Asphalt Jungle, Hagen read for the part for producer Arthur Freed . She did a dead - on impression of Judy Holliday's Billie Dawn character from Born Yesterday, which won her the role . </Li> <Li> Millard Mitchell as R.F. Simpson . The initials of the fictional head of Monumental Pictures are a reference to producer Arthur Freed . R.F. also uses one of Freed's favorite expressions when he says that he "cannot quite visualize it" and has to see it on film first, referring to the "Broadway Melody" sequence . This is a joke, since the audience has just seen it . </Li> <Li> Cyd Charisse as the long - legged woman in the green sequined dress and Louise Brooks hair who vamps Gene Kelly in the "Broadway Melody" sequence . </Li> <Li> Douglas Fowley as Roscoe Dexter, the director of Don and Lina's films . </Li> <Li> Rita Moreno as Zelda Zanders, the "Zip Girl" and Lina's friend . </Li> </Ul> <Li> Gene Kelly as Don Lockwood . His performance in the song "Singin' in the Rain" is now considered to be iconic . </Li>

Who are the actors in singing in the rain