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.

The story spans from 1965 to the early 1970s. Heavily pregnant Zhao Di, the unwanted second wife of an older man, was chased out by her husband's family and forced to return to her own family. She gave birth to a pair of twins, Shun Fatt and Su-mei. As Su-mei had two moles on her face, which was said to be bad luck, she decided to give her up due to the pressure of wanting to build a better life for the rest of her family.

Zhao Di takes over her family farm with the help of Ah Long after the 1969 floods. After the government started reclaiming land for development in 1977, licensed owners like Zhao Di are compensated but her brother accuses her of having an affair with Ah Long to get the money for himself. Meanwhile, Osman does not approve of his son playing in a rock band as he fears the negative influence, causing his son to run away from home. As for Ah Hee and Rani, they decide to get married but their traditional parents are against it.

The story of four ex-cons struggling to reintegrate into society – Tiger is a former gangster who took the rap for his boss Blackie; Mad Dog is a serial criminal who has apparently been convicted of every single offence in the Penal Code except for 'unnatural sex'; Panther was betrayed by his partner during a robbery attempt; while Jian Ren was a soon-to-be groom convicted of sex with an underage prostitute during his bachelor's night party.

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.

The story continues with Ah Kun, Osman and Shamugam forming a political party C.M.I to contest in the 1988 General Election.

When a teen is sent to private school, trouble finds him involving a bully and a basketball championship. Adapted from Adeline Foo's bestseller.

Ah Huang, Ah Qiang and Ah Hui have been friends for as long as they can remember. When Ah Huang's mounting debts drive him to desperate measures, Ah Qiang and Ah Hui agree to lend him money. He uses the money to build an illegal business. Even after the business become successful, he refuses to repay the money to his friends. However, when the business collapses, Ah Huang is forced to question everything as his family, friendships, and remaining money are all threatened.

King of Hawkers centres around Zhang Nala (Dawn), who returns to Singapore from Hong Kong to restart her life at her family-run bak chor mee stall after divorcing her rich playboy husband (Collin Chee). Operating next to Nala's stall are others selling local cuisines, such as Ah Lau's Cantonese Cuisine, run by Liu Derong (Hugo) and Bestest Indian Food, which is operated by Raja (Das DD). When a multinational company organises a competition in an attempt to buy over Nala and other hawkers' recipes and businesses, they work together to retain their legacy.