Wicked Science: A Day in the Life. Russ and Sasha's bickering leads to them inadvertently causing an accident in Toby's shed/lab - that results in them swapping bodies. For an episode that's pretty Elizabeth-lite, this is actually a pretty funny and entertaining one, with the actress who plays Sasha being particularly good at playing dorky-Russ-in-Sasha's-body. And I am impressed by the creativity being displayed by the writers this season given that the softening of Elizabeth means she is no longer causing most of the problems in this show.
