WHAT IF, in the unforeseen future, when there are not enough boys in Singapore? If Girls have to serve National Service also, what will happen? The story will focus on the first batch of female recruits, a bunch of Gen Z teens and youngsters with different backgrounds and education. As they trained under the fierce leadership of Sergeant Chow and Lieutenant Roxanne, they find themselves being pushed to the limit of their potential. Together, they overcome hardship and initial resistance to serve NS and discover newfound abilities, using it to solve and mend relationships in their personal life as well.

Sergeant Chow’s actions are misconstrued, but in the face of tough challenges, the girls develop a stronger bond and mature together. Lieutenant Roxanne Tan complicates Joey's relationship with her boyfriend. The girls go through gruelling obstacles in their GBMT journey, which eventually lands them in a dangerous situation and their actions will shock the nation.

The fourth addition to the franchise sees the return of the army boys including Sergeant Ong, Lobang, Ken Chow and Aloysius, joined by a new female officer, as they are called back for in-camp training under the Armoured Formation of the Singapore Armed Forces. Hilarious situations happen when they are back training together and their military roles reversed. Their brotherhood is also put to the test when new enemy threats arise.

Hornet (played by Jay Shih) and Mark (played by Nadow) decide to end their careers as assassins with a final mission. Along the way, they meet their former classmate, Sha Bao (played by Gadrick Chin), a drug lord's god-daughter Talia (played by Amber An), and her friend Ira (played by Apple Chan) from the Philippines. Things get complicated as they are each hunted by their own enemies. Action ramps up as they begin their hilarious adventure in Taiwan.

Liang Xi Mei (Jack Neo) is finally back! Having retired, Liang Xi Mei spends her time looking after her two obedient grandsons. However, Liang Xi Mei still leads a colorful life thanks to her absent-minded BFF Guang Dong Po (Wang Lei), who frequently muddles things up, leaving Liang Xi Mei to resolve the mess; and Lion King (Henry Thia) who is now diagnosed with mild Alzheimer’s, causing confusion and frustrations for everyone. Robert (Mark Lee), Liang Xi Mei’s eldest son also adds to her woes. Robert is a dreamer who often schemes to get rich quick. This causes Liang Xi Mei to find him unreliable and puts all her hopes on her youngest son Albert (Benjamin Josiah Tan). Her favoritism stirs up jealousy within Robert, who vows to strike it rich to win back Liang Xi Mei’s approval.