Guest Stars Anna McGahan as Rebecca Kirkhope John Waters as Ian Kirkhope Casey Donovan voices Sat Nav Dane Brady as Young Ian Kerry Armstrong as Summer Claire Kavanagh as Young Summer Rachel Ward voices English Sat Nav Peter O'Brien as Chris Ling Cooper Tang as Cinta Robert Coleby as Ascher Kaarin Fairfax as Heidi Sophie Cox as Laurel Fikrte Bushell as Detective Sergeant Jeffries Thomas McClusky as Young Ascher Kye Marrable as Young Chris Emma Langfield as Young Heidi