How did an alien egg (or facehugger) get aboard the Sulaco at the end of the movie, Aliens?
We know there was one aboard because of the movie, Alien 3.
The alien queen stowed aboard the dropship, but she could not have laid any eggs because her ovipositor was destroyed in a fire. And she would not have had much time to lay eggs during the battle with Ripley aboard the Sulaco.
Did a facehugger sneak aboard the dropship too?