OUTLANDISH ‘OUTLANDER SWEATSHOP!

Weary cast & crew complain they're dead tired & freezing their butts off making hit show

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SMASH hit "Outlander" is brimming with drama behind the scenes as exhausted cast and crew are bashing the Starz show as one of the most grueling sweatshops in TV, insiders spill.

According to a source, staffers are "working ridiculous hours, often on freezing locations" in Scotland, and no one gets special treatment — not even headliners Sam Heughan, 41, and Caitriona Balfe, 42.