Liam Neeson makes shock appearance in 'Derry Girls', to fan delight

Liam Neeson head shot
Liam Neeson made a surprise appearance in Derry Girls. (WireImage)

Derry Girls burst back onto screens with its third and final season, but while fans were excited to see the sitcom's return they were not prepared to find that Hollywood star Liam Neeson was a part of it.

The Taken star made a shock cameo in a police station scene where he questioned the girls in the opening episode, leaving viewers reeling.

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Erin and co had broken into their school to try to find out their GCSE results, but in the process had aided a completely separate computer equipment burglary and were taken to the police station to explain their actions.

However, the scene took an unexpected turn when the stern voice of an officer speaking from the shadows was revealed to be none other than action film star Neeson.

Playing Chief Constable Byers, he interrogated the gang who eventually managed to escape jail with the help of Erin's great uncle Colm boring Neeson's character into releasing them.

One viewer tweeted: "Keeping Liam Neeson's guest appearance under wraps for this must have been the best kept secret in Derry..."

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Another excited fan added: "As if the return of Derry Girls wasn’t exciting enough….. they bring in Liam Neeson."

Derry Girls S3 Specials (L-R) Michelle Mallon (Jamie - Lee O'Donnell), Orla Mccool (Louisa Clare Harland), Erin Quinn (Saoirse Monica Jackson), Clare Devlin (Nicola Coughlan), James Maguire (Dylan Llewellyn)
Derry Girls returned for season three on Tuesday night. (Channel 4)

Someone else commented: "Uncle Colm boring *actual Liam Neeson* to death is everything I never knew I needed - god I have missed this show."

Another viewer wrote: "Everyone screaming 'OMG it's Liam Neeson' at the telly."

The shock was even greater as many viewers had been convinced they were about to see Line Of Duty star Adrian Dunbar as Ted Hastings when they heard the officer's voice.

Derry Girls cast with GCSE results
The group were desperate to find out their GCSE results. (Channel 4)

One viewer tweeted: "When you think it's Ted Hastings and then his face comes out of the shadow and it's LIAM NEESON."

Someone else agreed: "I was fully expecting Adrian Dunbar to walk into the interrogation but Liam Neeson was brilliant."

Derry Girls stars Saoirse-Monica Jackson, Nicola Coughlan and Siobhan McSweeney and began its final season on Tuesday night, which will take the 90s-set sitcom up to the Good Friday Agreement and the girls ending their GCSE year.

Watch: Derry Girls final season trailer released on St Patrick's Day