RecruitingBehavioural interventionComparing Two Different Emotion Therapies for Autistic Youth and Young AdultsToo few clinicians are able and willing to help autistic patients. A recent review identified challenges to mental health service delivery in autism, including a lack of interventions designed for community implementation and limited workforce capacity. It has been argued that improving impairment in emotion regulation has the potential to improve a range of mental health difficulties in autistic people. In this clinical trial, the investigators are comparing two evidence-based interventions for emotion regulation, to determine if one created specifically for autistic people is clinically superior. The interventions will be implemented in the community, through partnering agencies.