1. “The Caves of Androzani”
Even if you're not a huge fan of the Fifth Doctor, "The Caves of Androzani" is almost universally known as one of the all-time great classic Doctor Who episodes. Although it doesn't feature any familiar foes, and has one of the more annoying companions in the classic show's history, "The Caves of Androzani" is the perfect capper to Peter Davison's run as the Doctor. He is forced to make the ultimate sacrifice to save his companion Peri at the end of a four-part story with seriously awesome cliffhangers and a strange antihero/villain guy that we're still hoping to see again someday. It's almost impossible to describe how awesome "The Caves of Androzani" really is; just see it! It's on Netflix!