FIX-67 is one of Dexter's many maintenance robots tasked with the upkeep of the lab and repairing broken inventions. In the episode "RoboDexo 3000", FIX-67 discovered the broken remains of the Robo-Dexo 2000 after Dexter scrapped it and had it replaced with the Robo-Dexo 3000. FIX-67 then began fixing the Robo-Dexo 2000 without Dexter knowing, and eventually this proved beneficial when the Energy Thief appeared on Earth and the Robo-Dexo 3000 betrayed Dexter. With the fully repaired Robo-Dexo 2000, Dexter was able to save the day.
- In the credits, he is simply referred to as "Fix-Bot".