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ITV crime drama Trigger Point has made its comeback for a third series with Vicky McClure returning as bomb disposal specialist Lana Washington. The latest series, which includes Jason Flemyng in the cast , follows Lana and her colleagues as they probe a bomb threat that quickly emerges as the beginning of a dark vendetta: someone is hunting down specific targets and seeking retribution. Collaborating with the Police Counter Terrorism Unit, the Bomb Disposal Squad must work frantically to locate the bomber before they strike their next target. Within moments of Sunday's series premiere - which can also be streamed on ITVX - viewers were flocking to social media to express their delight at its comeback. One viewer commented: "Love a #TriggerPoint return on a Sunday evening," reports the Express . Another remarked: " It's time for #TriggerPoint I've been looking forward to this all week." A different fan wrote: "Been waiting for this! #triggerpoint." A fourth enthusiast declared: "So excited #TriggerPoint." Hinting at Lana's mental state in the third series, Vicky McClure revealed: "She's not coping. Lana is a strong person, and she likes to see herself as a perfectionist, but I think we very quickly see that's starting to crumble. "We know from the previous two series that she has experienced a lot of loss, which was always going to catch up with her eventually, and this is the start of it. "So we are going to be dealing with PTSD, plus she's struggling with tinnitus, and she is relying on medication to get her through. She's quite a lonely character at the beginning of the series." This year's cast welcomes Jason Flemyng, who takes on the part of Steven Wyles in the ITV programme - a character who seems thoroughly disillusioned with the establishment. Discussing his role before the series launch, the performer explained: "The truth is, he's another little man that's fighting the system and has been hard done by. "In his head, the catalyst system and profit before people, he's had enough and he takes retribution. "He's not without reason, and Vicky's character isn't battling him politically or emotionally; it's just that he's breaking the law and doing something that puts other people in danger. So, that's the essence of their relationship, I think." Trigger Point airs on ITV1 and ITVX