Police are searching for a man and a woman in connection with an assault at the Savoy Cinema in Grantham.
The pair are said to have attempted to gain access to screens at around 6pm on January 10 but were challenged by a member of staff.
They then assaulted the worker who stopped them.
Investigating officers said the member of staff had been left shaken but was not injured in the incident.
Anyone who recognises the man and woman in the CCTV images, or who believes they can assist with the investigation, should contact Lincolnshire Police on 101, quoting incident 399 of January 10.