They are moves that cause a large amount of damage, comparable to "Super Moves" found in various other fighting games. True to their name, these moves consist of a short sequence of attacks that zoom in on the target with an X-Ray and displays bones and organs being crushed, smashed and snapped, dealing massive damage. The player must completely charge up the Super Meter in order to perform an X-Ray Move.
While incredibly powerful, a few X-Ray Moves require special conditions to be met. For example, Johnny Cage (MK2011) and Sonya Blade (MKX) both have X-Ray Moves that are classified as a counter-attack, meaning that it is only performed if they are attacked within a few seconds of the player activating it. Other limitations include X-Ray Moves that can only be activated from an aerial position, such as Cyber Sub-Zero (MK2011) and Takeda (MKX), and the fact that the damage inflicted by an X-Ray is altered based on the damage scaling.