Hassan (P. Ramlee) is 10 when his father died. His mother had died when he was younger. His late father's boss feels sorry for Hassan and adopts him. However, Hassan's foster father's own child, Aziz (Jins Shamsudin) is jealous of Hassan and hates him. When both of them have fully grown up, Aziz and Buang (Salleh Kamil) always bully Hassan. At the same time, Salmah (Saadiah) has developed a crush towards Hassan, fuelling Aziz's fury. When the Second World War is approaching, the Royal Malay Regiment begins recruiting young soldiers.
| Actor | Role |
|---|---|
 P. RamleeSarjan Hassan | Sarjan Hassan |
 SaadiahSalmah | Salmah |
 Jins ShamsudinAziz | Aziz |
 Salleh KamilBuang | Buang |
| CCapten John Gray RMRNot listed | Not listed |
| CCapten David Downe R.M.Captain Holiday | Captain Holiday |
| DDaeng IdrisPak Lebai | Pak Lebai |
| AAini JasminMinah (Pembantu Rumah) | Minah (Pembantu Rumah) |
| NNyong IsmailBapak Salmah | Bapak Salmah |
| LLeng HusseinAh Ling (Penjual Sayur) | Ah Ling (Penjual Sayur) |
 Omar RojikNot listed | Not listed |
 S. ShamsuddinNot listed | Not listed |
| MM. RafeeNot listed | Not listed |
| AAdek JaafarHassan Kecil | Hassan Kecil |
 Kemat HassanNot listed | Not listed |
| OOmar SuwitaNot listed | Not listed |
| ZZainol BakarNot listed | Not listed |
| AAli FijiNot listed | Not listed |
| HHabibah HarunSalmah Kecil | Salmah Kecil |