Two new stars are set to join Zac Efron and Vanessa Hudgens on High School Musical 3. Mark Propkop and Gemma McKenzie beat out hundreds of other contestants for the roles. It is unclear what parts they will play in the third installment of the series.

A source says Gemma is “13 years old and beat out 600 girls from three countries.” Mark has previously appeared on episodes of Miley Cryus’ show ‘Hannah Montana’ and the sitcom ‘The Office.’

High School Musical 3 is set to be released in theaters on October 24.