An upcoming episode of UPN's Star Trek: Enterprise will address the so-called Klingon issue head on: Why do original-series Klingons have smooth foreheads, while their counterparts in subsequent series and films have bumpy ones? The 15th episode of the current fourth season Enterprise, called "Affliction," is the first of two parts that will deal with the question, the official Star Trek Web site reported.

Mike Sussman wrote the episode, based on a story by executive producer Manny Coto. The second part is called "Divergence," written by Judith and Garfield Reeves-Stevens. The episodes will air Feb. 18 and 25, the site reported.

In the episodes, the Enterprise heads back to Earth for the official launch of the Columbia NX-02, Starfleet's second warp ship, commanded by Erika Hernandez. Phlox is abducted by aliens and finds himself in the presence of Klingons who tell him the Empire is facing its gravest threat in centuries. Along the way, as Archer and company investigate and pursue, it's revealed that one of our main characters has a secret past, which comes into play, the site reported.

The Doc is sitting here saying that he always knew Hoshi was a Klingon.