Channel 4
E1
Nazi Crypt, the Cannibal's Caves, Hall of Screams
Where to watch
Seasons & Episodes
E2
Gateway to Hell, Monk's Curse, the Queen and the Concubine
E3
Myth of the Vampire, Lost Inca Gold, King Arthur's Cradle
E4
The Secret Escape, Tower of Torture, A King's Untamed Lust
E5
The Missing Pearl Treasure, Spirit of Revenge, a Secret Strength
E6
Frankenstein's Truth, a Death Ritual, Reaching DaVinci
E7
Bastion of Power, Joan of Arc, Crusade in the Holy Land
E8
Escape from Colditz, Art Asylum, Death not Dishonour
Cast
More from Andrew McPherson · Lead actor
More like this
Castle Secrets — streaming FAQ
Which OTT platform streams Castle Secrets?
Castle Secrets is streaming on Channel 4 in United Kingdom. It's not currently on Netflix.
Is Castle Secrets on Netflix?
No, Castle Secrets is not on Netflix in United Kingdom as of October 2026. It's currently on Channel 4.
Is Castle Secrets on Amazon Prime Video?
No, Castle Secrets isn't on Amazon Prime Video in United Kingdom right now. It's on Channel 4 instead.
Where can I watch Castle Secrets for free?
Castle Secrets is available to stream free (with ads) on Channel 4 in United Kingdom.
How many seasons are in Castle Secrets?
Castle Secrets has 1 season in total (8 episodes). The series concluded in 2023.
Are all episodes of Castle Secrets out yet?
Yes — all 8 episodes across 1 season of Castle Secrets are out and available to stream.
Is there a Season 2 of Castle Secrets?
No — Castle Secrets ended after 1 season, so there is no Season 2.
