Some recurring characters have been played by different actors in different films or episodes. Many main cast members have been portrayed by different actors due to flashbacks, and [(mumble) insert (mumble) technobabble (mumble)] shenanigans. Of course the 2009 reboot opens up a universe of characters being played by a new generation of actors.
Which Star Trek character was portrayed by the most different actors?
- The character must be substantially the same: alternate timelines count at the same character, but for example, Shinzon is not Picard.
- Janeway played by a lizard counts, just because it won't affect the answer and it makes me chuckle.
- "possessions" (Spock in McCoy in Star Trek III and everyone in "Facets") do not count. This is DeForest Kelley playing Dr. McCoy containing some aspect of Spock, not DeForst Kelley playing Spock. The litmus test is, Would the IMDB or the credits reasonably credit Kelley as Spock? (This is going to be a little debatable, but it doesn't appear it will affect the accepted answer.)