Webnot related in real life, helen slater and christian slater play underprivileged siblings in the legend of billie jean. Webshe is best known for playing the dc comics superheroine supergirl in the 1984 film supergirl, as well as appearing in films such as the legend of billie jean (1985),. Webchristian michael leonard slater (born august 18, 1969) is an american actor. He made his film debut with a leading role in the legend of billie jean (1985) and gained wider. Webdespite their shared last name and similar careers, helen and christian slater are not related. They have different parents, different ethnic backgrounds, and different family histories. Helen’s parents are alice joan, a lawyer and peace activist,. Coming as a pretty big surprise, as willow (warwick davis) and his crew are on a quest to rescue the captured prince airk, they find themselves captured and. Webhe played the brother of the title character portrayed by helen slater (no relation), and he fell hard for the actress. At the time, she was supergirl. Webone last tidbit regarding helen slater’s fictional brother: Christian slater later admitted in an interview that he had a big crush on helen slater while making the “the legend of billie.