Russell and I were going to join forces against Tom. Tom was going to find out that his first wife was alive and running this whole military operation, and she was Szura's boss." William Fichtner (who played the character Tom Underlay) also stated the following about the development of the storyline:  "There was something in there that I thought that was so good," said Fichtner. "I discovered who it really was who was orchestrating [everything]. I didn't even see it coming from a million miles away. It was my [first wife, Grace], who got on the plane with me. Two people lived after that [1996] plane crash, not just one. She went in another direction altogether. It's amazing. It was, 'ah, what you could have done with that.' "  In 2010, Labine gave an interview that detailed some of the ideas for season two and the entire show : "The idea of the show was we never gonna win. It was a evolutionary step. What was happenning was not a invasion at all, it was a evolutionary step. So we're basically gonna spend 5 seasons tryin' to win this battle we can't win. It was just the end of the human nature -- the human kind -- as we know it." He also said: "Larkin was going to come back as a evolved hybrid and i was going to join a militia to kill her." "Invasion" features an orchestral score performed by the Hollywood Studio Symphony Orchestra and composed by Jon Ehrlich and Jason Derlatka, incorporating many recurring themes and dramatic melodies. Their music was well received. The soundtrack of the show became available on October 21, 2008 at "moviescoremedia.com". The album features more than 60 minutes of carefully selected tracks from the series. "Invasion" is one of Ehrlich and Derlatka's favorite works saying: "Its always a treat working with a great orchestra. We love working with Shaun Cassidy."