Turlough's panic puts him aboard a pirate ship where Captain Wrack uses his presence to invite all the other captains over for dinner. She's been picking off a few of her greatest rivals in the race and now sees an opportunity to clear the field once and for all and become the clear winner.
Did You Know?
The Doctor replaces his stalk of celery with one from Captain Wrack's ship. Rather curiously, both stalks come from buffets which are essentially figments of other people's imagination (Castrovalva and the Buccaneer both being "unreal"). See more
These creatures have vast powers, that's why none of them must win. To achieve further power would be a disaster.
But the other ships - you can't stop all of them.
We can but try.