10. "The Crusade"
This felt like the natural choice for the unlikeliest animation. For one reason, the season it's a part of has already been released on Blu-ray. In fact, Season 2 is currently the only season from the black-and-white era to get the Blu-ray treatment so far. It's not surprising, especially since - quite amazingly, really - "The Crusade" is the only story from Season 2 with any missing episodes.
Theoretically, there isn't anything stopping the BBC from animating this story at all. Certainly, there have been more than a few stories that fans have had to double dip for with their DVD and Blu-ray releases.
But there's also the fact that Charles Norton, who worked as animation producer and director on several releases, specifically named it as a story that's unlikely to ever be animated. And the reasons he gives for this are pretty convincing.
"Episodes one and three survive on film, episodes two and four don't, and in episodes two and four, there's something like 26 speaking characters, and most of them have three different changes of clothes, and [those characters] aren't in episodes one and three!"Charles Norton
It's a shame, especially as "The Crusade" is such a great story. On the other hand, the photo reconstructions used for the missing episodes on Blu-ray are extremely good. At the very least, they help to give the viewer a great idea of what these missing episodes were like. I won't say that these episodes will never be animated, but with so many other missing stories to focus on, they're bottom of the list for now.