Dr. Jack Thorne was a retired professor of Applied Engineering featured in The Lost World and owner of 'Thorne Mobile Field Systems'. Throughout the novel he is primarily referred to as 'Doc'. He supplied the team with the Mobile Lab and High Hide. He believed that theories were a waste of time because they changed too often. When he was a professor he set up odd tests for his students such as finding a way to get the answers to a quiz off the ceiling using only q tips and a box of liquorice. He was not featured in the film and his characteristics and actions were transferred to Eddie Carr, his assistant in the novel, and Roland Tembo.

Thorne also had a tight relationship with Arby and Kelly as well as Levine.

In the book, he also had an extremely low temper and swore a lot (especially at his assistants).

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