10 Worst Ever First Officers In Star Trek

10. Will Decker

In a way, this is low hanging fruit. Decker, son of the late Commodore, only appears in The Motion Picture where we, the audience, are treated to a series of the man's demotions. Decker, in fairness to him, did very little to deserve these things.

Now, why is he here? If we take the pros first - he knows the Enterprise far better than Admiral Kirk at this stage, even saving the ship with his knowledge in the wormhole - then there is a lot to like. 

However, as the template for Will Riker, Decker left a little to be desired. For example, though he mostly took his demotions on the chin, his inability to separate the Ilia probe from Ilia herself leads to him taking the first opportunity to dive off the ship. While the script reasons are obvious - there needed to be a spot for Spock to fill - he did seem a bit keen to get out of there. Let us say that Decker earns his spot here for taking less than a heartbeat to ditch his role and run off with an approximation of the woman he loved.