Yes it is a filler episode used to fill some of the qs raised in the 2nd series but it is a very good filler episode. We needed answers about the artefact and Beverly and the whole connection between them ans we got them. It also eliminated the question about Henry. i don't care how 'I care about the world' someone is. There is no way you would work along side the woman who killed the woman you love. i'm glad Henry's integrity has been restored.
Also i wonder where Henry is being taken. i hope he doesn't leave the series. He is the best character ever. I really want him to return in some form. Please hurry up series 3. I'll have no nails left from the suspense
In short, top marks for this episode. Also GO HENRY