|Season One, Episode Four|
|Air date||October 27, 2005|
A Cat in the Dark
A Determined Cat
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The Grinning Cat is the fourth episode of Black Cat.
With Rinslet, Sven goes to rescue Eve. Train easily defeats most of Torneo's men, but Sven is able to get to Eve before him. As he catches up with him, Train tries to shoot Eve, but is punched by Sven who escapes with her. With Eve having decided to join Sven, Torneo activates a device planted on Eve that turns her into a monster by controlling the nanomachines inside her body. As Eve is ordered to kill Train, Sven manages to escape from Torneo's men with Rinslet's help. Sven removes the device at the cost of being stabbed. Train then destroys all of Torneo's experiments, collapsing his castle. While Sven is healing, Train once again attempts to shoot Eve but decides not to do it remembering Saya's way of life.
- This wouldn't be the last appearance of the nanomachine control device. It appears again in episode 21.
- Train finally understands a gun is for more than killing.