One of the Doctor Who spin-offs will be host to a very special guest star, one that is familiar to Doctor Who fans from decades past. I'm leaving the revelation of who it is until after the jump so those not wishing to be spoiled about it don't have to be.

This week's Lost audio podcast featured more hints and teases than real answers. Since it's close to the season finale, hosts Damon Lindelof and Carlton Cuse only gave fans indications of what to expect in the next three weeks. They did manage to review "The Brig," preview "The Man Behind The Curtain," and answer fan questions, however. Here's a quick recap:

• The writers knew for several seasons that Anthony Cooper was the original Sawyer. They actually thought it had become fairly obvious.
• Lindelof and Cuse were tight-lipped about "The Man Behind The Curtain," but mentioned that we will learn much more about Ben and Jacob. Richard Alpert will also be seen next week.