`` Monsters vs. Aliens '' about Earth-born `` monsters '' taking on megalomaniacal alien . `` Monsters vs. Aliens '' is relatively harmless -- a toothless satire with a knee-jerk feminist theme and a sorry excuse for a plot . Film 's main character is almost 50-foot woman voiced by Reese Witherspoon . Comment:
`` Monsters vs. Aliens '' about Earth-born `` monsters '' taking on megalomaniacal alien . Film 's main character is almost 50-foot woman voiced by Reese Witherspoon . Comment: