Jesse Kilmartin (played by Forbes March) is a character on the television show Mutant X. He is extremely intelligent and acts as the main technological expert of the team, being able to hack even the most complex computer systems within minutes. He is classified as a Molecular New Mutant and can control his own body's density - allowing him to phase through objects or make himself invulnerable to harm. He later gains the ability to phase and mass other people and objects by touch. Jesse is a very sensitive person. He is also sweetly naive and good-natured guy in his early 20s. He gets offended with the word Freak which is another word for his New Mutant Classification. Jesse has a fear of being buried alive. Jesse is the son of manipulative covert operative Noah Kilmartin. Both his wealthy father and his grandfather Major William Kilmartin had won medals for their military service, but Jesse rarely saw his grandfather because of animosity between the two men. Though Noah’s work habitually kept him far from home, Jesse remembered occasional pizza parlor visits and yearly father-son martial arts competitions until his parent’s divorce. Jesse first discovered his abilities in high school, while engaged to Alisha Keary, the daughter of the wealthy industrialist family with whom he used to spend summers. Fleeing from a life where he could not fit in, Jesse joined Mutant X to find a new family and sense of purpose.