TITLE:"A Life-or-Death Battle! Machine Divine Emperor Dragon Asterisk" is the one-hundred and forty second episode of Yu-Gi-Oh! 5D's.

DESCRIPTION : In the heat of their battle with Aporia, Leo was eager to try and protect his friends, but his offensive turns out to backfire, and Jack and Luna take a great deal of damage. Leo then stands dumbfounded before his collapsed friends, whileAporia, jumping at the opportunity, summons the Machine Divine Emperor Dragon Asterisk and launches an attack. The three are driven into a predicament. In the midst of all that, Leo bravely stands up against Aporia, even though Aporia repeatedly asks the boy and his friends to surrender if they wish to hold on to their live.

As Leo decides to fight and take on all the damage to protect Jack and Luna, Ancient Fairy Dragon helps revive Leo, giving him his own Mark of the Dragon and evolving Power Tool Dragon into Life Stream Dragon.