Joining in with 50th anniversary fervour

No, not a royal jubilee, but something more important by far - of course, it's Dr Who... here's my attempt at a poetical friend's challenge to write a Dr Who triolet (rhyme scheme ABaAabAB in case you're not familiar with the form). Enjoy! (and yes, I do own a Dalek head...)

Clara Oswald, the Impossible Girl,
Oswin the Dalek makes souffles in space,
echo in time, tumbling pearl,
Clara Oswald the Impossible Girl,
heart of the TARDIS, temporal whirl,
War Doctor’s saviour so full of grace,
Clara Oswald the impossible girl,
Oswin the Dalek makes souffles in space.