Incursion
This sequence is near the end of the F4 movie, where we see an actual incursion happen. 2 earths colliding, and the reference to “first steps” in the title is because it’ll be the F4 first steps into adventuring out into the multiverse into our universe.
I believe since it’s confirmed there is only 1 galactus, that galactus will be traveling through the multiverse via incursions devouring planets for his next life cycle and Reed has to build a life raft to escape thus being their first steps out into the multiverse.
This sequence is near the end of the F4 movie, where we see an actual incursion happen. 2 earths colliding, and the reference to “first steps” in the title is because it’ll be the F4 first steps into adventuring out into the multiverse into our universe.
I believe since it’s confirmed there is only 1 galactus, that galactus will be traveling through the multiverse via incursions devouring planets for his next life cycle and Reed has to build a life raft to escape thus being their first steps out into the multiverse.