Charles Xavier is a telepathic mutant who started the Xavier's School for Gifted Youngsters.
Upon finding Sabretooth was working with the Brotherhood of Mutants, Charles sent Wolverine to track him. Later, when Wolverine returned to the X-Mansion with the Teseract, the school was attacked by Magneto as a result of its presence. In response, Xavier sent a psychic message to the X-Men, telling them to protect the students. After the attackers had been defeated, Jean informed Xavier that Magneto got away.
Training some students how to control their powers, Xavier found them lacking in confidence. Xavier decided on various demonstrations to help the students improve, bringing in people with laser, mind control and telekensis powers to provide the students a frame of reference.