The one where the Daleks meet their final end...
It's such a pity we can't see these later episodes because the return to Skaro is really very exciting. That spine-tingling heartbeat thrum, the sparse, angular sets against the black backdrops, the short-tempered Black Daleks! Almost 40 years later, the Emperor Dalek made a reappearance in Doctor Who in the Eccleston series finale, and Nicholas Briggs did a grand job of reproducing its grandiosity and booming god-like tones. I also love it when a Dalek snaps "Moo-oove!"
Maxtible really isn't letting go of his dream to turn metal into gold, the secret of which has been promised to him by the Daleks. Now, I'd normally scoff at Maxtible's obviously misplaced faith, but it seems that Dalek science can indeed transmute base metals into gold, and invent a machine to coax Maxtible with. Why they go to all that trouble just to get him to walk through a doorway I'm not sure, but still... it seems that alchemy is possible. Even the Doctor admits it is considered "scientifically possible" in the 20th century.