SmokeyPokey (the little traitor!) has stayed behind, tempted by the offer of delicious grub. And the stowaway was actually Donuel's pre-programmed robot, built to resemble a normal-sized wombat. It had been smuggled aboard to interfere with the Crumpet Detector and guard the illicit Fentanyl.   
The African man chucks it overboard, having re-programmed it to attach a small drone to SmokeyPokey, who is soon whizzing towards the Pirate ship, scowling angrily.
Crates of the illegal opiate are now bobbing about on the waves, and the old lady is re-hydrating herself with some Old Speckled Hen ale.
The African man, his much-restored wife and the now-complete contingent of Siamese cats dance a cheery Ivorian Mapouka on the deck of their ship, as it sails into the sunset.