This works on any creature not currently on its home plane. For willing victims, it's a safe and painless way to travel through hostile areas.
Sources: DMG, d20 SRD; The Planewalker's Handbook page 136
It is okay to stare in awe at the wonders of the planes, but you should learn to do this with your mouth closed or people will start slapping them shut.
— Sigilian guide giving friendly advice to new planewalkers
