When Sabine accuses the Clones of giving the Rebels up it's discovered that Wolffe had secretly alerted the Empire to their presence and hid the messages which Ahsoka had sent them. Still trying to convince Rex to join them, Rex believes that he's outlived his usefulness for war. While Sabine was uploading the list of bases, Rex told Ezra was a great example of a leader.

Having completed their side of the deal, Kanan wanted his crew to leave but Rex invited them to stay for dinner. Zeb was swallowed by the Joopa but succeeded in killing the creature. While participating in the Joopa hunt, it's revealed that Zeb is acting as both the 'hunter' and the 'bait'. To allay Kanan's distrust of Clone troopers, Rex revealed that he, Gregor, and Wolffe had managed to remove their inhibitor chips. Despite Wolffe's complaints, the Clones decided to give them the list as long as they return the favor by helping them hunt a Joopa. When they left, Wolffe warned Rex and Gregor that if they help them, they could be putting themselves in danger. Agreeing to this, Rex asked them to wait outside while he creates a list. Ezra then suggested that he could give them a list of bases in the outer rim. When Ezra Bridger told him that she needs his help, he explained that his days as a soldier were over. Allowing the Rebels into their home, Rex asked how Ahsoka was doing. Rex soon found out that the Ghost Crew were sent by his old Jedi commander Ahsoka Tano. After a brief skirmish, Rex soon calmed his brothers down. But when Kanan Jarrus realized that Rex, Wolffe and Gregor were Clones, he pulled out his Lightsaber. One day, while trolling the grounds of Seelos, Rex was introduced to the Ghost Crew. Rex, Wolffe and Gregor then spent their retirement on Seelos in a All Terrain Tactical Enforcer and occasionally hunted Joopas for food. Eventually, Ahsoka and Rex escaped and managed to fake their deaths before leaving to live in exile.ДЄfter the Clone Wars ended, the Emperor retired all the Clones, believing they have served their duty. To distract the Clones, Ahsoka released Maul and allowed him to escape.ДЄfter discovering a report from Rex about the inhibitor chips, Ahsoka managed to remove Rex's inhibitor chip, thus freeing him from carrying out Order 66. While Ahsoka and Rex were returning to Coruscant after capturing Maul, Emperor Palpatine issued Order 66 resulting in the Clones, including Rex, turning on Ahsoka. Anakin and Obi-Wan were willing to travel to Mandalore, but were forced to return to Corsucant as Chancellor Palpatine had been kidnapped by General Grievous.ДЄnakin however, managed to assign Rex and a battalion of clones to Ahsoka to travel to Mandalore to aid in the capture of Maul.

Sometime later, Ahsoka came into contact with the Jedi Order and requested the help of the Jedi in retaking the planet. Near the end of the Clone Wars, the former Sith Lord Maul had taken control of Mandalore with the help of the Death Watch and A group of Criminals and Gangs that have sworn allegiance to Maul. He later convinced Wolffe and Gregor to remove their chips as well preventing them from executing Order 66. The two fought in many battles together, and later with his apprentice: Ahsoka Tano, whom Rex fought alongside until the Siege of Mandalore.ДЄfter his friend Fives died trying to convince him that there are control chips inside all the clones heads, Rex soon did some investigating, and found out the truth. Rex served as the captain of the 501st Battalion, under the command of Anakin Skywalker.

1.3.3 Infiltrating the Imperial Interdictor.

Star wars rebels s 4 ep 9