After a lengthy, spoiler-filled discussion about "The End of Time," Dan and Mike answer e-mails (plural) about the proposed connection between The War Chief and The Master, and then finally settle into the topic of the episode: "Spearhead from Space," Jon Pertwee's first outing as The Doctor. (If you'd like to skip past "The End of Time" conversation, it takes place between 1:36 and 36:17.)