Doctor Who is pretty good at conquering his enemies, and now it looks like he might top the music charts too.
Two songs connected with the hit sci-fi show are tipped to make it into the top 40 because of new rules on how the chart's put together.
Any song can be in the charts now, even if it's just available to download.
A song from the Dr Who Christmas special, and a tune sung by Billie Piper, are up against each other.
Radio 1 DJ Chris Moyles is trying to get a song by former Doctor's assistant Billie Piper into the charts by asking his listeners to download it. The track's called Honey to the Bee and was released when Billie was a pop star in the late 1990s.
Fans who go on some Doctor Who websites are also downloading a song called Love Don't Roam, which was played in the Christmas special, to try to get that into the top 10 too.
The changes in the chart rules have already seen a big difference in what's in the top 20. Snow Patrol's Chasing Cars - first released in July 2006 - has come back into the charts because of its downloading popularity.