The 22-year-man was attacked by a group of approximately six people as he walked to a fast food outlet on the Garrison in the early hours of Sunday 15 July 2012.
He was initially taken to Darlington Memorial Hospital with a suspected fractured eye socket and nose, and bruising to his head, neck and back. He was later transferred to James Cook Hospital in Middlesbrough but has since been released.
PC Nicola Pattinson of Catterick Safer Neighbourhood Team, said:
This was a disgraceful attack on a passer-by which has resulted in serious facial injuries. I need to find out exactly what happened and am appealing to anyone who witnessed the incident or knows anything about it to contact me as soon as possible.
Anyone with any information is asked to contact North Yorkshire Police on 101, select option 2 and ask for PC Nicola Pattinson. Or you can call Crimestoppers anonymously on 0800 555 111, quoting reference 12120114680