Looks like the opening of TTT will be Gandalf and the Balrog afterall!
1. Foundations Of Stone
Yet it has a bottom, beyond light and knowledge,' said Gandalf. 'Thither I came at last, to the uttermost foundations of stone. He was with me still. His fire was quenched, but now he was a thing of slime, stronger than a strangling snake.'
And wow, a lot of vocal work too!