apr 20, 1978 - William Stryker sends his son Jason to Xavier's School for Gifted Youngsters

Description:

in the hope he could be cured of his mutation, but Jason is instead encouraged to embrace his mutation by Xavier.
Stryker becomes furious and withdrew Jason from the school.
Over the next year, Jason grew increasingly angry with his parents and blamed them for his mutation, to which he began to use his powers to torment them, planting horrific illusions and images in their minds.
Stryker's wife eventually committed suicide by applying a power drill to her left temple, in an attempt to bore the images out and end the torment.
William Stryker puts his son in a cryogenic prison in his Three Mile Island facility.