Thrax Sa'kat

Thrax was a Cardassian male and the head of security on Terok Nor before Odo. He had left the space station by 2365, saying he had grown weary of Skrain Dukat. SS DS9 (Foundlings))

In 2373, Odo, experiencing a telepathic version of the Great Link that took the form of Terok Nor, placed Thrax in his place as security chief when several Bajorans were falsely accused of attempting to assasinate Dukat and executed on the Promenade. 

During the Dominion War, Thrax was a member of an underground railroad who helped get Cardassians out of Dominion's reach. In 2375, he came to Deep Space 9 to get Odo's help in investigating the disappearance of a ship carrying Cardassians. SS DS9 (Foundlings))