The single, which was co-written by Stan and Vince Harder, was written specifically to coincide with the themes within the film of rising beyond personal circumstances and societal expectations.
"We wrote Start Again to inspire anyone that may feel that they are lost that there is always a second chance... we wanted to create an uplifting song that made people feel there is always a way through," Walker said.
Start Again will appear on the movie soundtrack that will be released via Sony Music on August 24, featuring music from the movie curated by P.Money.
Stan, who made his acting debut in 2013 in Mt Zion, appears in the film as 'Benjy'- best friend to main character 'Tu Kaea' played by champion hip hop dancer Tia-Taharoa Maipi.