Guest Stars Jason Watkins as Stanley Fox Kara Tointon as Young Elsie Henry Lloyd-Hughes as Young Elias Calam Lynch as 20s Archie Dainton Anderson as Little Archie Linda John-Pierre as Mae Oaklee Pendergast as Teen Archie Peter Ellis as Elias Leach John Moraitis as Doctor Hartman Samantha Colley as Barbara Harris Olivia Brody as Young Jennifer Ellie MacDowall as Jennifer Grant Akil Largie as Luke Kelly Coughlin as Liz Nathan Clough as Official Barbara Barnes as Mary Fox Mary Stewart as Lucy Cartwright