The first thing that will happen with the gravedigger is Alec getting punched in the face by her, which will lead to him deploying his already accumulated NPCs to restrain her for the take over. I'd be thrilled to have someone either 1. see him get punched in the face while surrounded by his puppets or 2. see the middle of the whole possession process.

And come on Dax, you're a tentacle monster. Give Alec some slack here!