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Professor T season 4: Release date and latest news

Everything you need to know. ***CONTAINS MAJOR SPOILERS FOR SEASON 3***

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Eagle Eye Drama

Published: Wednesday, 19 August 2026 at 11:00 am

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Six months on from the tragic events of Professor T season 3, the crime drama's fourth outing finds Ben Miller's Jasper "still in torment" following the death of his colleague Lisa and "unable to face police work".

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"His therapist, Helena, is sad to see all his progress has been undone," the synopsis adds.

Meanwhile, Dan is "desperately throwing himself into work, refusing to let his mind spiral into grief while growing increasingly frustrated by Jasper's absence".

But when a young woman disappears from a luxury yacht, Jasper is "forced to get involved against his better judgment", bringing the two men back together as tensions between them continue to grow.

So, when can we expect the new episodes? Read on for everything you need to know about Professor T season 4.

Professor T season 4 release date: When will it air?

Professor T returns to ITV1 on Wednesday 19 August at 9pm.

All six episodes will also be able to stream on ITVX.

Professor T season 4 cast: Who's returning?

Two investigators, a woman in a dark blazer and a man in a grey shirt, sit across a table from two people in a modern interior. Papers, phones and a small video camera on a tripod sit between them as the investigators listen intently.

Professor T. Eagle Eye Drama

Alongside Ben Miller as Professor Jasper Tempest, the following cast members are also returning:

Zoë Wanamaker has also joined the cast as Jasper's aunt, Zelda Radclyffe, while Dan also has a new colleague, DC Chloe Highsmith (Vampire Academy's Rhian Blundell).

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The main cast will also be joined by several other returning faces and new guest stars alike.

Professor T season 4 plot: What will happen?

The series will pick up six months after the events of season 3, with Winter, Tempest and the rest of the team still coming to terms with the death of Donckers as they turn their attention to a "dangerous crime wave", as reported by Variety.

"Well, it was quite a dark series, wasn’t it?" said Ben Miller of season 3. "The whole series ended on such a tragic note. I think people were very shocked by what happened with Lisa. The fans of the show are really invested in all the characters and their stories."

Focusing on season 4, Miller continued: "He’s almost gone back to square one in terms of his OCD. We’ve previously seen him trying to take the gloves off, literally and metaphorically, but he ended up pulling them back on after Lisa’s death."

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Professor T. Eagle Eye Drama

"For whatever reason, he didn't comfort her as she was dying," added Miller. "The darker side of his nature took over, and he's carrying a lot of guilt from letting her die like that. He wanted to change before, but he's really determined to change now. He can't let that happen again."

Elsewhere, romance is on the cards for Adelaide, the "lines between professional and personal become blurred" for Helena, and Winter becomes Maiya's right-hand man.

Is there a Professor T season 4 trailer?

Yes – and you can watch it below:

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Professor T season 4 premieres on ITV1 on Wednesday 19 August at 9pm.

Add Professor T to your watchlist on the Radio Times: What to Watch app – download now for daily TV recommendations, features and more.

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Check out more of our Drama coverage or visit our TV Guide and Streaming Guide to find out what else is on. For more from the biggest stars in TV, listen to The Radio Times Podcast.

Authors

A head and shoulders shot of Abby Robinson. She is in front of a grey background, looking at the camera and smiling. She wears a black zipped-up jacket with an elaborate gold and maroon design

Abby RobinsonDrama Editor

Abby Robinson is the Drama Editor for Radio Times, covering TV drama and comedy titles. She previously worked at Digital Spy as a TV writer, and as a content writer at Mumsnet. She possesses a postgraduate diploma and a degree in English Studies.

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