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Callsign (2026)

Callsign

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May 11th, 2026

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Season 1
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2026
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Synopsis

In the shadowy corridors of present-day Britain, where systems whisper secrets and survival demands silence, "Callsign" unveils a world where duty and trust clash in a gripping dance. This is no mere fantasy of espionage; it's a harrowing descent into the raw emotional truth of what happens when loyalty outlives its welcome. Every command, every choice, every silence echoes with the weight of consequence. This is a tale of how far individuals will go to safeguard what's left, revealing the true cost of service.

John Tennant, once a celebrated counter-terrorism commander, finds himself on the outside after a disastrous operation. But when a young MI5 analyst turns up dead, her case file marked for internal scrutiny, Tennant is discreetly summoned back to lead a temporary taskforce. What starts as a routine review spirals into a perilous quest for truth within the heart of the state. Tennant gathers a reluctant team: Tom Brookfield, a brilliant MI5 analyst with ties to Tennant's unresolved past; Amira Khalid, an MI6 liaison whose role is more about observation than assistance; and Major Karim Sadiq, a Defence Intelligence officer whose gaze never falters.

As political forces close in, they unearth a covert protocol stealthily reactivated within Britain's infrastructure. The more they dig, the more they realize it’s not malfunctioning—it's designed to operate exactly as intended. For those who revel in decoding mysteries, dissecting dialogue, and championing flawed yet human protagonists, "Callsign" promises ethical tension, found-family dynamics, and psychological realism akin to the likes of "Spooks," "The Bodyguard," "Slow Horses," and "Line of Duty.

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Directors

Darren Jaundrill
Full cast & crew

Writers

Darren Jaundrill
written by
Full cast & crew

Keywords

tv mini series

Country of Origin

United Kingdom of Great Britain and Northern Ireland

Languages

English

Release Dates

May 11th, 2026 (United Kingdom of Great Britain and Northern Ireland) (internet)

Alternative Titles

Callsign (Australia)
Callsign (Canada)
Callsign (India)
All Alternative Titles

Aspect Ratios

16:9 HD (720p)

Production Companies

Callsign TV (produced by)

Distribution Companies

YouTube (web-series)

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