Theory:K9 television discontinuity and plot holes/Jaws of Orthrus


 * Although K-9 never stated it in previous episodes, Starkey says K-9 comes from the 50th century and all publicity for this series states the same. However K-9 actually came from the 51st century.
 * K-9 came from the year 5000. Depending on how you are defining a century, it could be either.