A little strange that the gallifreyans are telling their kids so many stories about the sontarans, but hey ho.

This story is another fine one, it feels very fairy tale in it's morals (teamwork, brotherhood, courage, strength, and intellect all being useful, etc), but the story itself and the way it conveys those themes feels quite functional.

Like, it's a good story, dont' get me wrong, and the way they get those themes across is good, but that's just it, it's very much just 'good' as it were. It never does anything to make it rise higher than that