T was not only brilliant casting de Lancie as the original Q...he has the perfect sense of play, humour and arragance...but it was ingenious casting the wonderful and underrated Garrit Graham as a second Q.
Graham (Used Cars, Phantom of the Paradise, Class Reunion, MULTIPLE television appearances, genre films and sequels) was perfectly cast. Not only is he well known for humorous campy horror, and quite capable of playing a de Lancie-type trickster Q himself, he sold us on a sympathetic Q...an adorably selfless and philosophical Q.
He maintained the Q humour, but where de Lancie plays (to perfection) fun arrogance, he played sweet whimsy. I also give this episode kudos for showing a pathos side of (de Lancie) Q. One that feels. One that understands immortality perhaps, even if he doesn't wish it upon himself like his counterpart.
Graham fits the Q family perfectly (above Bernsen or Plakson). He and de Lancie (along with some fun writing) showed a very entertaining yin and yang to the Q continuum.