See the first story for disclaimers etc.
With Friends Like These... 
Marcus L. Rowland
"That's the situation," said Martha, "If the Master wins he'll start with Earth and conquer the universe. I know it isn't your fight, but one day he might find a way to follow you."
"Ach, waily, waily!" shouted one of the mac Feegles
"The bigjob kelda has the richt of it," shouted another; "Nae King! Nae Quin! Nae Laird! Nae Master! We willna be fooled again!"
"Nae Master!" yelled the Pictsies.
"Thanks guys," shouted Martha, "but..."
"Gie' they Toclafane some heid!"
Martha sighed. She had no doubts about their enthusiasm, but talking to the pictsies was giving her a headache.
Crossover with Terry Pratchett's Discworld, of course
I think this fits the theme of the other stories, but I'd love to see someone write a longer "Pictsies on the Valiant" story in which the Master learns just how bad a mistake he has made annoying them...