The Intruder S1E4 18 October 2025 on BBC Four

On Saturday 18 October 2025, BBC Four broadcasts The Intruder!

Season 1 Episode 4 Episode Summary

The upcoming episode of “The Intruder” on BBC Four promises to be filled with tension and intrigue. In this episode, Paula is determined to uncover the truth about Tess. As she follows Tess’s past, Paula visits the places where Tess grew up. This journey leads Paula to some unsettling discoveries about Tess’s identity. It becomes clear that Tess may not be the person she claims to be and that her connection to the Martel family is more than just coincidence.

At the same time, Camille is feeling increasingly anxious at home. With Paula away, Tess seizes the opportunity to strengthen her place within the family. Camille’s growing discomfort suggests that she senses something is off about Tess, but she may not yet grasp the full extent of the situation.

Viewers can expect a gripping narrative that explores themes of trust and deception. As Paula digs deeper into Tess’s background, the stakes rise for everyone involved. The episode is sure to keep audiences on the edge of their seats as the story unfolds. “The Intruder” continues to blend suspense with complex character dynamics, making this episode a must-watch.

What Time is the Episode On?

The episode of The Intruder will be broadcast on October 18 2025 on BBC Four at 10:35 PM.

Is the Episode New?

The episode of The Intruder is all new!

The Intruder Cast & Stars

Main Cast

Episode Videos & Previews

Watch The Intruder Online

Watch the show online

The Intruder Series Information

An au pair everyone adores. A mother no-one believes. We don't always know who we're letting into our homes. Tense, stylish psychological thriller.