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c. 32 BBY
Boomer was sent to the city of Lessu with the 501st Legion. Boomer and Rex went a routine scouting mission on AT-RTs. On the mission, they took out several battle droids. The two saw a dark figure run off into the dark. The two chased them, only to be captured by the bounty hunter, Cad Bane, the mysterious dark figure. Bane ordered Rex and Boomer to defend his gravity weapon, so he would not blow them up. The two were successful. Boomer and Rex were rescued by Jedi Anakin Skywalker and Ahsoka Tano. The two would exact their ironic revenge on Bane, putting him in cuffs.
Boomer, Rex, Tano, and Skywalker would be ambushed by Skakoan bounty hunter, Kul Teska. Teska created the gravity weapon and was angry with Bane. Skywalker and Tano fought with him, but were at a disadvantage until Boomer and Rex showed up and intervened. Teska took the gravity weapon and Bane's ship, as well as Bane himself.
- Star Wars: The Clone Wars: Republic Heroes