Cyclops (Scott Summers) is a fictional character, a superhero that is the field leader of the X-Men in the Marvel Comics Universe.
The first X-Man recruited by Charles Xavier and one of the original five X-Men, Cyclops has had a large presence in X-Men-related comics since their inception. He has also been featured in almost every adaptation of the team in other media.
In practically every incarnation of the character, he has almost always been shown to be not only Charles Xavier's most loyal student, but also the one who most believes in his dream of mutant and human equality. His loyalty to Xavier has cost him dearly from time to time, yet the character remained by Xavier's side until recently. In turn, Xavier is known to view Scott as one of his most (if not the most) prized pupils, and looks upon Scott not as a mentor to mentee, but rather as a father to a son.
Cyclops has the power to emit beams of energy from his eyes. Although the beams have the appearance of red light (i.e., electromagnetic radiation in a red wavelength), they do not heat objects but instead deliver tremendous concussive force. Some accounts describe Cyclops' eye beams as the product of his body metabolizing sunlight and other ambient energy (much as his brother Havok metabolizes cosmic radiation) and releasing this energy in the form of beams (hence in some stories Cyclops depletes his body's energy reserves and needs to recharge through exposure to sunlight). Other accounts suggest that Cyclops' eyes may contain apertures to another dimension, releasing powerful energies from that dimension into his own in the form of beams. Whatever their exact source, these beams or 'optic blasts' are tremendously powerful, able to rupture steel plates and pulverize rock.
Depending on the amount of energy channeled, the beams can be released in various widths, appearing in enormous bursts on rare occasions. They have been observed to level a skyscraper, or can be focused tight enough to punch a pin hole in a dime. Cyclops' beams have also been demonstrated to reflect off certain shiny surfaces; in concert with Cyclops' intuitive sense of spatial geometry, this reflective quality of his beams allows him to bounce the beams off many different surfaces in rapid succession so as to strike a desired target from an unexpected angle. Summers is immune to the harmful effects of his own powers — the natural psionic field which surrounds his body safely absorbs the energy of his beams if they should come into contact with his body. Scott is also immune to the power of his brother Alex, and vice versa. However, he is not immune to Vulcan's powers.