Automatically loading external MC after the previous has finished. Like Ch in a movie

Hi, I am having trouble figuring out how to automatically load external movie clips so that they load and play after the previous movie clip has finished. I have attached a simplified version of the files that I am working with.

The files are set up as so:

Main.fla : this is the main file in which all of the other movie clips are loaded into.
Movie1.fla, Movie2.fla, Movie3.fla : These movies need to load and play after the previous movie has finished playing.

I hope this is enough info in order to figure out.