Gadem was sent by Dozle Zabi to deliver supplies to deliver supplies to Char Aznable's forces to replenish his Musai. However, as Gadem was transporting the supplies he was detected by the crew of the Earth Federation White Base, who sent out Amuro Ray in the RX-78-2 Gundam and Ryu Jose in the FF-X7 Core Fighter to stop him.
As Char and the crew of the Musai fought off Amuro and Ryu's attack, Gadem and his men attempted to unload as many supplies as possible into the Musai. Though their ship was ultimately destroyed, Gadem managed to escape in his Zaku I.
Later, despite Char's warnings, Gadem piloted his Zaku I and went to engage the Gundam to avenge his lost honor. However, Amuro manages to fight off and destroy Gadem's Zaku I, killing him.
Principality of Zeon