This first special includes events up to 13. episode of Gundam Seed Destiny.
It sums up the events quite well and many new scenes and several changes to old ones have been made.
Even though they did a fine job at squeezing 13 episodes into one movie i dont recommend watching this special instead of the real thing. For someone that didn't watch GDS it might be comfusing and you will miss a lot!
But i highly recommend this for those fans that want to refresh their memory of good times while watching GDS.
I give this movie special a 10 because i belong to that group of people and i loved it!