Anxiety and depressive disorders are common in adolescents, however they are often unrecognized. Rational emotive behavioral therapy (REBT), a form of cognitive behavioral therapy (CBT) is efficient for children and adolescents. School settings are appropriate environments to deliver such interventions for vulnerable youths. Given youth's access and predilection to use technology, a video-based prevention program was developed. The present study aims to investigate the efficacy of a transdiagnostic REBT prevention program for internalizing symptoms in adolescents, implemented in a school setting.