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In case you skip it...

As the first episode of season three, “Evolution” introduces a few changes:

  • Worf has been promoted from Lieutenant Junior Grade to full Lieutenant.
  • Geordi has been promoted from Lieutenant to Lieutenant Commander.
  • Dr. Crusher is back from Starfleet Medical and is once again the Enterprise’s Chief Medical Officer. Dr. Pulaski has transferred elsewhere.
  • Fancy new uniforms!
    Publicity shot of the crew in their new uniforms

Also, in this episode, Wesley accidentally creates a race of sentient nanomachines dubbed “nanites.” They leave the Enterprise and adopt a presumably-uninhabited planet as their homeworld.