Tilda Cobham-Hervey as Helen Reddy

Danielle Macdonald as Lillian Roxon

Evan Peters as Jeff Wald

Chris Parnell as Artie Mogull

David Lyons as Dale Muir

Matthew Cardarople as Roy Meyer

Dusty Sorg as Dany Cornelius

Coco Greenstone as Young Traci

Melody Beck as Mercury Records Receptionist

Simon Edds as Mercury Records Employee

Damien Strouthos as Nightclub Comedian

Franc Violi as Nightclub Owner

Genevieve Davis as Helen's Neighbour

Aaron Sloss as Reporter

George Rafael as Reporter

Lily Donat as Greenwich Club Artist

Jodi Phillis as Greenwich Club Artist

Eric So as Los Angeles Realtor

Adriano Cappelletta as Los Angeles Maire'D

Gregg Arthur as Mike

Scout Bowman as Young Teen Traci

Toks James as Deep Purple Security Guard

Michael Gosden as Music Producer

Adrian Breakspear as Music Engineer