In this satirical science fiction comedy, a group of Martians arrive on Earth, not as the typical "little green men," but as large, bug-eyed creatures with a taste for human destruction. They use various weapons, including a ray gun that turns humans into insects as a part of their invasion.
There are also other movies with insect-like aliens from space, but "Mars Attacks!" is the most famous and recognizable for its humorous take on the classic alien invasion trope.