|[List of appearances]|
Jimmy Grossman is one of Rex Fury's leading gang members, alongside Eddie JoJo and Spikey Don. He was first seen leading a raid on Vinnie Pappalardo's ice cream parlour, alongside Vitus Tinkleman and Maximilian Jarvik. Chase McCain drops an enormous glob of ice cream on him, causing him to fall into a box and allowing Pappalardo and McCain to interrogate him. They force him to spill the beans on where he was meant to go by feeding him ice cream. He tells them that he and Eddie JoJo were going to pull off something at the construction yard later that night. McCain departs, and Pappalardo, with a sinister tone, says that he will stay behind, further interrogating. He was seemingly released by Pappalardo (or rescued by another gang member), as he is again fought in Forrest Blackwell's secret base and again arrested.