Where can I watch Zero Day for free?

Watch Zero Day free in HD on Castle. Download the Castle App to stream all seasons and episodes with English, Hindi, Tamil, Telugu audio — no subscription, no signup needed.

How many seasons of Zero Day are available on Castle?

Castle has all 1 seasons of Zero Day, with a total of 6 episodes streaming free in HD.

What languages is Zero Day available in?

On Castle, Zero Day is available in English, Hindi, Tamil, Telugu, all in HD.

Who stars in Zero Day?

Zero Day stars Robert De Niro, Jesse Plemons, Lizzy Caplan, Connie Britton.

When did Zero Day first premiere?

Zero Day premiered on 2025-02-20 and is now streaming free on Castle.

Is the Castle App safe to download?

Yes. The Castle APK is a verified safe file. It requires only basic Android permissions and does not need root access. Compatible with Android 6.0 and above.

Zero Day

2025•6 epsIMDB 7.4

Crafted by the series creative team, Zero Day Season 1 brings Robert De Niro back alongside Jesse Plemons in a chapter that refuses to slow down. Set against United States, the season unravels A former U.S. President is called out of retirement to find the source of a deadly cyberattack, only to discover a vast web of lies and conspiracies. with drama storytelling across 6 episodes, exploring themes of drama in ways that elevate the series to new heights.