Hi,
Extracts from the book 'The History of Middlesbrough'
On the 11th March, 1861 the Theatre Royal, Durham St was opened by J.C. Hunter with J.W. Benson, Charles Vernon and Mrs Corfield, artists who were later to appear on the London stage.
There is a little bit more info on the Theatre Royal. If there's anything you'd like me to look for, let me know.