Intangibility (other) – The ability to turn another into a phantom.
The Phantom Zone Projector would send a person into the Phantom Zone and there was no way to escape from this dimension. The Phantom Zone Projector first appeared in Adventure Comics V1 #283.
Alan Moore figures out how to use the Phantom Zone Projector to destroy Mister Mxyzptlk in Action Comics V1 #583. Mister Mxyzptlk is a reality warper and one of the most powerful beings in the DC universe so destroying him is no easy task.
The DC Silver Age had any number of phantom zone trapped based plot lines (Action Comics V1 #131, Adventure Comics V1 #283, Green Lantern V1 #20, Jimmy Olsen V1 #12, Lois Lane V1 #33, Strange Adventures V1 #48, Superboy V1 #162).