Old Bill has grumbled his way through the trenches of the First World War. Now it is the Second and, envious of his son, Young Bill, he decides to enlist. He finally enters the Pioneer Corps, which is based near his son. When Young Bill goes missing during a raid, Old Bill shows that there's still life in the old dog yet!
| Actor | Role |
|---|---|
 Morland GrahamOld Bill | Old Bill |
 John MillsYoung Bill | Young Bill |
 Mary ClareMaggie | Maggie |
 Renée HoustonStella Malloy | Stella Malloy |
 Rène RaySally | Sally |
 Gus McNaughtonAlf | Alf |
 Ronald ShinerBert | Bert |
 Manning WhileyChimp | Chimp |
 Janine DarceyFrançoise | Françoise |
 Roland CulverColonel | Colonel |
 Donald StuartCanuck | Canuck |
 Nicholas PhippsBBC Reporter | BBC Reporter |
 Allan JeayesWilloughby | Willoughby |
 Ian FlemingClub Member (uncredited) | Club Member (uncredited) |
 Philip Friend(uncredited) | (uncredited) |
 Arthur HamblingShelter Delivery Man | Shelter Delivery Man |
| EEdward LexySoldier | Soldier |
| AAl MillenLance Corporal | Lance Corporal |
 Bill ShinePub Customer | Pub Customer |
| PPercy WalshGustave | Gustave |
| JJohn WarwickRecruiting Officer | Recruiting Officer |
| BBen WilliamsPoliceman | Policeman |
| GGeorge SpenceOld Soldier (uncredited) | Old Soldier (uncredited) |
| GGeorge SpenceOld Soldier The Proud Valley | Old Soldier The Proud Valley |