Mouse was once imprisoned in the Saucy Mare's brig and put under Mr. Jimmy's guard. She was the only person to escape from his cell, as only Mouse can do. She left her mouse symbol on the cell wall.
Mr. Jimmy and the Saucy Mare first visited Mainframe in season 1 when it raided the city for software. The crew managed to capture Bob and Mr. Jimmy was in charge of keeping a watch on their valuable prisoner. Bob tried to reach through the bars and take the keys from his sleeping guard but was stopped by a force field. Mr. Jimmy jumped up and laughed, saying he loves it when prisoners do that. He never snores when he really sleeps. Bob managed to trick Captain Capacitor and Mr. Jimmy into thinking he escaped by hiding in a hidden file that Mouse left behind. They opened the door to search for him, allowing Bob to escape.
They tried to leave the system but Dot Matrix convinced Captain Capacitor that commerce was more profitable than piracy. They became partners in intersystem commerce.
After Mainframe was cut off from the Net the Saucy Mare tried to open up trade in other systems but ended up in trouble. Mr. Jimmy and most of the crew was arrested and the Saucy Mare was impounded in the Desert Port Systems harbor. With the help of Matrix and AndrAIa, Captain Capacitor freed Mr. Jimmy and his crew, retook the Mare, and fled the system.
They quickly went to the Edge of Beyond in order to enter the Web and search for Bob. The crew covered the Mare in dead Web Creatures to protect it from the Web and Ray Tracer stabilized the Tear so that they could enter the Web.
The ship ended up in a battle with the Web Riders. Mr. Jimmy was indispensable in fighting the Riders. They nearly lost until Bob arrived calling off the battle. The Saucy Mare transported everyone to the Web Address of Mainframe, once there it encountered traps laid by Mouse each one worse than the last. The Saucy Mare was almost destroyed but Bob merged with Glitch and stabilized the tear, opening the way to Mainframe.
After the Viral Wars Mainframe began to crash. As the city collapsed Mr. Jimmy and the crew of the Saucy Mare were seen in the Principal Office sharing a drink with Old Man Pearson, Binky, Algernon, and Mr. Mitchell. (End Prog)
Mr. Jimmy later attended Dot Matrix's failed wedding.