10 Star Trek Characters With The Most Extreme Development

10. The Doctor

First appearing in Caretaker, Robert Picardo's Emergency Medical Hologram was presented as rigid, suffering from a very artificial manner - one that could hardly be called a decent bedside manner. The first season of Voyager concentrated on having the crew treat the Doctor a little poorly - though the stand-out episode Heroes And Demons goes a distance to improving this.

Over the course of seven years, the Doctor becomes an integral part of the crew. But, more than this, he quickly grew from a colder medical technician to one who strove for more, to then becoming an artist, performer, teacher, and confident.

The Doctor that the audience sees by the time Voyager returns to the Alpha Quadrant is a totally different interpretation to the one we were introduced to in the pilot. This is thanks in no small part to Robert Picardo's performance. He took the character brief - lightbulb with a hypospray - and helped develop that into one of the most endearing, engaging characters in the entire franchise.

As it stands, we have yet to see his return to Star Trek, but this is a hologram who is seemingly ageless. The smart money says he'll be back, perhaps with a song sheet or two in hand.