Well to tell you the truth I thought Beyond Skyline ( Skyline 2 ) was the best one. I just bought another copy of that one on Blu Ray today. They are all good but #2 is my favourite. Plenty of action right to the end . I like the first one as well that's the original film and the 3rd one is pretty good but yeah the second one is great. Its like the Scorpion King movies I like the 5th one the best , Scorpion King Book of Souls as it gets back to its Egyptian roots.