So there is the well-known story of how Denise Crosby was in for the role of Troi and Marina Sirtis was almost Hernandez (who became Yar), until Gene Roddenberry switched them. Then throughout the first season, Crosby wasn't happy with the development of her character leading to her asking to be released from her contract whilst the writers didn't know what to do with Troi, resulting in the character not appearing at all in three episodes. I'm assuming had the decision not been taken and we'd ended up with Crosby-Troi and Sirtis-Hernandez that things might've gone much the same, with Troi being a headache for the writing staff, but would Crosby have become as scunnered with Troi as she did Yar, or might there have been something to the counsellor that saw her wanting to carry on. How might things have progressed with the two actors in their initial roles and what might it have meant for the characters? Would Crosby still ask to leave resulting in Troi being killed off? Would she have stayed and maybe become a recurring character? Had she gone what would happen with the third chair in the command area? How might Hernandez and Data's relationship changed over seven years? There are loads of other things to consider, so what are everybody's thoughts?