Milky Way's Mass: 1.5 trillion solar massesspeed: 1.3 million mphComposition: Solar systems, dust, as, etc..
A collision between the Andromeda galaxy and the Milky Way galaxy would be a very realistic and entertaining movie idea.
Andromeda and the Milky Way's Mass, speed, composition, and path will be the same. Andromeda and the Milky Way will be one light day away at the very start of the Movie
Andromeda's Mass:~1,23 billion M☉ Speed: 110 km per second Composition: Solar systems, dust, as, etc.. Path: is headed for the Milky Way
Part 2
Scientists already predict this event to happen in 4.5 billion years making this idea very realistic.
The Hubble telescope has presented scientist with prove in the form of wavelengths that the Andromeda galaxy is headed for us and will crash in to the Milky Way galaxy
This crash will effect Earth and having the focus on Earth showing what will happen to it and what humans might do would make it very entertaining.
Part 3
The movie would start with scientist warning people on the news of the collision but cut short by a scene if andromeda crashing into the Milky Way
The collision scene would show parts of the Milky Way and Andromeda breaking off and merging, followed by a close up of where the Earth ended up. The Earth would be a lot closer to star causing it to heat up and the humans on it to come up with creative ways to survive.
The movie would be about what happens to Earth and it would be very entertaining having a sort of survival theme.