Barbie Grease - Cha Cha Doll Race Day- Silver Label by Mattel. The Barbie Collector Doll Grease Cha Cha is the must have of the season. Barbie as Cha Cha celebrates the enduring excitement of the movie musical Grease in her iconic outfit from the Thunder Road drag race. She wears cropped pants, a fitted sweater, and signature neck scarf, all reminiscent of the fabulous fashions of the 1950s. Even after all these years, Grease is still the word!