Zinkydoo is a near-indestructible robotic pony from the future. She traveled back in time to save the future leader of Earth, John Connor, from an evil liquid-metal terminator pony.
 
After killing the bad pony in a vat of molten steel Zinky tells John that in order to guarantee Earth’s safety she too must die. But there’s a problem - Zinky’s programming will not permit her to kill herself - John must kill her. But John loves Zinky and doesn’t want to loose her. Zinky convinces him that her immediate death is the only option and orders him to push her into the vat of molten steel.
 
Grief stricken, John agrees. He guides Zinky to the platform over the vat of steel. As Zinky gets closer and closer to the edge of the platform her emergency programming kicks in and forces her to want life. John must shut out his emotions and push Zinky to her death.
 
At the edge of the platform Zinky panics. She screams in terror. She begs John to stop. John knows Zinky must die. He pushes her over the ledge. Zinky falls into the fiery cauldron of molten steel and her body melts into oblivion. John feels sick. An emotional wreck he lies down on the platform and cries.