In the first X-Men film by Bryan Singer, "X-Men", the following conversation takes place between Wolverine and Professor X:
PROFESSOR X: This device amplifies my powers, allowing me to track mutants across great distances; that's how I intend to find Rogue.
WOLVERINE: Why don't you just use it to find Magneto?
PROFESSOR X: I've been trying, but he seems to have found some way to shield himself from it.
WOLVERINE: How would he know how to do that?
PROFESSOR X: Because he helped me build it. Now, if you'll excuse me.
This scene indicates that the Professor's telepathy is somehow being blocked. After the train station fight sequence, we are given an explanation why, shown here:
WOLVERINE: You said he wanted me.
PROFESSOR X: I made a terrible mistake; his helmet, somehow designed to block my telepathy. I couldn't see what he was after until it was too late.
What makes this statement so intriguing is that in the Stan Lee/Jack Kirby series, "The X-Men", Magneto and the Professor are shown communicating telepathically on several occasions, and later in the 90s, the show "X-Men: The Animated Series" showed that the Professor was able to get inside Magneto's head with no problems whatsoever, regardless of the helmet. So, I was curious; did Bryan Singer simply invent the bit about Magneto's helmet, or was this something from one of the comics that was overlooked in the animated TV show?