The Star Trek franchise has a large cast of characters across its various television series and movies. Here are some of the main characters and what you should know about them:

1. Captain James T. Kirk: The captain of the USS Enterprise in the original "Star Trek" series and several films. He's a charismatic leader who is often torn between his duties as a Starfleet officer and his personal beliefs.

2. Mr. Spock: The half-human, half-Vulcan science officer of the USS Enterprise. He is known for his logical, unemotional approach to decision-making, and also his conflicted relationship to his more emotional, human side.

3. Jean-Luc Picard: The captain of the USS Enterprise-D in "Star Trek: The Next Generation". He's a sophisticated and cultured character who is known for his strong sense of duty and his diplomatic skills.

4. Data: An android officer in "Star Trek: The Next Generation". He is searching for a way to become more human, and his struggles with his own identity are a major theme of the series.

5. Captain Kathryn Janeway:  The captain of the USS Voyager in "Star Trek: Voyager". She is regarded as a smart, determined and compassionate leader who faces numerous challenges while trying to get her crew home after they are lost in the Delta Quadrant.

6. Seven of Nine: A former Borg drone who joins the crew of the Voyager. She is a complex and multifaceted character who provides a unique perspective on questions of collectivism, morality and identity. Seven of Nine is a resourceful, intelligent member of the crew and often works closely with Captain Janeway on various missions.

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