In 1953, his first play, "Most Cruel the King", was produced at the national Habima Theater, creating a stir amongst theatre goers. The play focuses on the figure of Jeroboam. In 1961, Habima produced his play "The King's Clothes", which established him as one of the country's leading playwrights. In 1963, Aloni teamed up with Yossi Banai and Avner Hezkyahu to create the "Seasons Theater", for which Aloni wrote and produced the play "The American Princess". From that point onward, Aloni produced all his plays. He also began writing skits for the comedy troupe Hagashash Hachiver, and produced some of their programs, such as "Cinema Gashash" and "Cantata for Shawarma".