Intangibility

Intangibility is the ability to alter the molecular structure of a person or object thereby lowering its mass and density to the point that it's molecules can slip between and through the molecules of another person or object. If the molecular dispersal is great enough, even light and gases may pass in between molecules. In speculative fiction, this is often demonstrated as a super-power common to ghosts, mutants and some species of aliens.

In Marvel Comics, the mutant superhero known as Kitty Pryde has the ability to render herself intangibile. She refers to this as "phasing". Kitty's intangibility is unique from other forms in that she can disrupt the electrical signals of technological equipment merely by phasing through it. This is a very advantageous ability to have, particularly when one faces up against robotic Sentinels.

Another hero who can call upon this power in her ever-growing bag of tricks is Andrea Thomas, better known to 1970s high school students as Isis. Isis has the ability to render other people or objects momentarily intangible. She once demonstrated this by making a speeding car pass harmlessly through a broken down tractor trailer that was in the middle of the road. Presumably, she can apply this power to herself as well.