History
After becoming emperor, Prince Dorrek VII imprisoned his younger brother Prince Dezan at Kral IV for several years with an inhibitor mask on his head since his face resembled a Kree or a human.[1]
When Hulkling became emperor of a Kree-Skrull alliance, Empress R'Klll captured him with the inhibitor mask and impersonated him. Teddy eventually broke free and stopped R'Klll, using the mask on her.[2]