Returning to active duty are familiar characters – Ken Chow (Joshua Tan), the spoilt, rich kid, who tries to 'keng' his way out of NS. Aloysius Jin AKA Wayang King (Maxi Lim), whose over-enthusiasm creates more problems for his cabin mates. Lobang (Wang Weiliang), the street-smart wheeler dealer, out to make a quick buck off his cabin mates. Joining them is new face Hei Long AKA The Black Dragon (Wesley Wong), an aggressive gang leader, who prefers to talk with his fists instead of his mouth.
Together, these ragtag band of misfits must somehow survive 40 weeks of training in hell. Do they have what it takes to become one of Singapore’s most fearsome military units – the frogmen?