Detectives have released security footage of an armed robbery at the Williamtown McDonalds in January.
Three people are shown approaching the front counter armed with guns and baseball bats.
The trio threatened staff before making off with cash.
Detectives yesterday arrested one of the accused at a house in Shearman Avenue, Raymond Terrace yesterday.
The 18 year old will face court today.
Police are hoping the video will help identify the other two bandits.
Anyone with information should call Crime Stoppers on 1800 333 000.