CW Philly First Look: 'Supernatural's' 300th Episode January 29, 2019 / 9:38 AM EST / CBS News Photo: Dean Buscher/ The CW Pictured (L-R): Samantha Smith as Mary Winchester and Jeffrey Dean Morgan as John Winchester Photo: Dean Buscher/ The CW Pictured (L-R): Jared Padalecki as Sam, Jeffrey Dean Morgan as John Winchester and Jensen Ackles as Dean Photo: Dean Buscher/ The CW Pictured (L-R): Jensen Ackles as Dean and Jared Padalecki as Sam Photo: Dean Buscher/ The CW Pictured (L-R): Jensen Ackles as Dean, Jared Padalecki as Sam and Jeffrey Dean Morgan as John Winchester Photo: Dean Buscher/ The CW Pictured: Jeffrey Dean Morgan as John Winchester Photo: Dean Buscher/ The CW The 300th episode will air Thursday, Feb. 7 at 8 p.m. on The CW Philly. Photo: The CW