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Chapter 37 [Jack Levin, Death God]
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A man calling himself the 'Death God of Thunder' is raging through Mute City. As Rick and friends wonder who he is, Lucy notices Jack Levin's Astro Robin pass by, surrounded by gangsters. The group is concerned and confront Jack about it, but Jack insists that it's nothing to worry about.

Jack was hiding the fact that he'd been meeting with Michael Chain, leader of the "Bloody Chain" gang. Michael knew secrets from Jack's past and was trying to use them to get Jack into the gang. At one time, Jack had owned the Mute City night, racing as he pleased and referring to himself as the "Death God of Thunder". Michael, knowing this, was trying to intimidate Jack by pretending to be this "Death God".

The top levels of the Intergalactic Police learn about Jack. So, Jack approaches Michael Chain, telling him he's quitting the Galaxy Mobile Platoon quietly, but settling his problems on his own. Satisfied, Michael decides to leave Jack be. 

Later, Rick invites Jack to rejoin the Galaxy Mobile Platoon, giving him a chance to put his past behind him for good. So, he rejoins the group, who all give him a warm welcome.