This chapter describes the application of Roberts's (2005) seven-stage crisis intervention model (R-SSCIM) and Myer's (2001) triage assessment model to youth experiencing a psychiatric crisis, defined as a suicidal, homicidal, or actively psychotic episode. Although most children have their first contact with mental health services during a crisis (Burns, Hoagwood, & Mrazek, 1999), there is relatively little research on crisis intervention, and almost nothing written on mobile crisis response for children and adolescents (Singer, 2006). This chapter is an effort to bridge that gap by presenting three case studies of youth experiencing suicidal, homicidal, or psychosis-driven crises. This chapter provides a realistic description of crisis intervention over the phone, in schools, at home, in the hospital, and in a youth homeless shelter. The chapter includes a review diagnostic criteria from the Diagnostic and Statistical Manual of Mental Disorders (DSM-5; American Psychiatric Association, 2013) for three disorders that are commonly found in youth experiencing psychiatric crises: depression, bipolar, and schizophrenia spectrum disorders. Throughout the chapter, dialogue is used to illustrate crisis assessment and behavioral and solution-focused intervention techniques.