Asa Butterfield
Jacob Portman
Rupert Everett
Ornithologist
Chris O'Dowd
Franklin Portman
Terence Stamp
Abraham Portman
Cameron King
Millard Nullings (voice)
Finlay MacMillan
Enoch O'Connor
Callum Wilson
Young Abraham Portman
Hayden Keller-Stone
Horace Somusson
Joseph Odwelll
Masked Twin
Louis Davison
Victor Buntley
Aiden Flowers
10-Year-Old Jacob
Nicholas Oteri
6 Year Old Jacob
Ella Wahlestedt
Prettiest Girl
Cameron Greco
Prettiest Teen Boy
Dino Fazzani
Pier Worker / Running Dad and Child
Brooke Jaye Taylor
Aunt Judy
Jennifer Jarackas
Aunt Susie
Dafydd Hywel
Isle - Farmer
Andrew Fibkins
Cousin Twin #1
Jack Fibkins
Cousin Twin #2
Badria Timimi
Police Woman
Stuart Davidson
1940s Villager
Dan Mersh
2016 Policeman #1
James Kermack
2016 Policeman #2
Christine Dalby
Uneasy Woman
Neil Broome
Holidaymaker (uncredited)
Jill Buchanan
Fun Fair Attendee (uncredited)
Tim Burton
Passenger on an Attraction (uncredited)
Joanne Manchester
Pier Visitor (uncredited)
Jason Redshaw
Passerby (uncredited)
Jackson Tessmer
Party Guest (uncredited)
Vic Waghorn
Pier Cleaner (uncredited)