Olivia Scott Welch. Olivia Scott Welch was 23 in The Party Slasher as 'The Party Crasher'.Teddy Padilla. Teddy Padilla was >> in The Party Slasher as 'Director, Writer, Producer, Cinematography, Editor, Casting, Art Direction, Makeup Effects, Sound, Camera Operator, Music Supervisor, Driver'Will Youmans. Will Youmans was >> in The Party Slasher as 'Writer, Producer, Assistant Director, Driver'Olivia Scott Welch. Olivia Scott Welch was 23 in The Party Slasher as 'Costume Design, Assistant Director, Camera Operator, Assistant Editor, Continuity'Bryce Jones. Bryce Jones was >> in The Party Slasher as 'Location Manager, Driver'