mˈɪstɚ. ˈɛmzˈaɪzptlk wʌz fˈɜːst kɹiːˈeɪɾᵻd tʊ ɐpˈɪɹ ɪnðə sˈuːpɚmˌæn hˈæʃ θˈɜːɾi sɛptˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi fˈoːɹ stˈoːɹi, "ðə mɪstˈɪɹiəs mˈɪstɚ. ˈɛmzˈaɪztplk".
Mr. Mxyzptlk was first created to appear in the Superman #30 (September 1944) story, "The Mysterious Mr. Mxyztplk".