The Mario vs. Basilisx battle is the twelfth battle in the series, between Mario and Basilisx (Yoshi, Sonic, and Luigi were turned to stone by his gaze prior to the duel) aboard the Omega Doomship when Basilisx challenges Mario to a duel (apparently to avenge a fellow koopa that Mario apparently threw into a pool of lava, although this may be a false memory, as Mario has no memory of such an incident). It takes place during Episode 8. Basilisx eventually is able to suffocate Mario using poison mushrooms, and is poised to kill Mario when Episode 8 ends. Episode 9 having not been released yet, what happens after this is unknown.