hiː dɪvˈɛləps ðə stˈoːɹi baɪ hˌævɪŋ tˈuː kˈʌpəlz tɹˈævəl tə pˈæɹəlˌɛl dᵻmˈɛnʃənz, ɪnwˌɪtʃ ðeɪ tʃˈeɪndʒ ðɛɹ ˈeɪdʒᵻz ænd sˈɜːkəmstˌænsᵻz.
He develops the story by having two couples travel to parallel dimensions, in which they change their ages and circumstances.