The main characters drawn together in a misconceived love riangle in the corrupt, pleasure-seeking world outside the cabaret were:Sally Bowles (Liza Minnelli in a bravura, career-defining performance), a flamboyant, amoral and effervescent American singer/performerBrian Roberts (Michael York), Sally""s bisexual boarding house tenant - a Britisher and English language teacherMaximilian von Heune (Helmut Griem), a homosexual German playboy-baron[In the original mid-1960s Broadway production version, he main characters were an American writer named Cliff Bradshaw and 19 year-old English cabaret singer Sally Bowles - reversed nationalities in the film.His hotel reservation had mistakenly been made for two days hence, and therefore he needed a place to stay for a few days." Jor-El then explained Superman""s unique differences:Earth""s sun is younger and brighter than Krypton""s was.] The screenplay by Morrie Ryskind (a co-screenwriter for the Marx Bros.""A Night at the Opera (1935)) and Eric Hatch was based on Hatch""s own short novel1011 Fifth Avenue.The film displays the mad-cap personalities of a wildly rich, eccentric family.One of its members - a flighty socialite/heiress, finds a down-and-out "forgotten man" tramp in a hobo colony during a scavenger hunt, and hires him as the family""s butler.