Terry O'Quinn has signed up for a guest role in the US sci-fi series Falling Skies.
The former Lost star (he played John Locke) ill appear in the final two episodes of the show's second season, Entertainment Weekly reports.
He will play a former history professor and mentor to Falling Skies main character Tom Mason, played by former ER star Noah Wyle.
As well as featuring in Lost, O'Quinn has had roles in shows such as JAG, Alias and The West Wing. Most recently, he had a part in the second season of Hawaii Five-0.
Falling Skies will return this summer to British satellite channel FX.
