Comic X was the Result of a glitch that happened with the Fun value,Mixing Sans’s sprite With other Tidbits of Sprites and colours. To make the glitch happen,you would have to get Two fun values on the same reset.

if you did,There would be absolutely no enemies,dialouge or characters until you get to snowdin,where you will meet comic X.

Throughout the Snowdin part,You Would constantly be stalked by comic X,as he watches in the background of the trees. if you made it to snowdin town,things would look incredibly charred and Burnt as fire erupts from some of the houses there.

Carry on walking,you will see comic x attempting to go into the Next loading zone,But can’t. After he finds you You will enter a battle With him that your forced to lose.

if you hacked Yourself to beat him,you would just be softlocked and unable to close the game.