Macet was a Cardassian gul in the Central Command, and commanding officer of the Galor-class warship Trager. In response to the destruction of a Cardassian outpost by the Federation starship USS Phoenix in 2367, Macet ordered his ship to attack the USS Enterprise-D. However, his ship proved no match for the Galaxy-class Enterprise-D, and he agreed to a truce after his ship was disabled.
Macet cooperated with Enterprise-D Captain Jean-Luc Picard in tracking down the Phoenix, which was believed to have gone rogue under orders from Captain Benjamin Maxwell. Macet brought two officers with him, Glinns Daro and Telle. In the interests of peaceful cooperation following the recently signed treaty ending the Federation-Cardassian War, Macet punished Telle when the latter was caught attempting to access secured systems aboard the Enterprise-D.
Ultimately, the Phoenix was located and returned to Federation space. However, Picard relayed Maxwell's allegations of a renewed Cardassian buildup to Macet, warning him, "we'll be watching." (TNG: "The Wounded")
Macet was the first Cardassian seen in the Star Trek saga and the only Cardassian to ever appear with facial hair.
Macet wears a different style of Cardassian uniform than most Cardassians seen later in Star Trek. The regular uniform has been established in time travel episodes and flashback sequences in as being used in the 2340s (DS9: "Wrongs Darker Than Death or Night") and the 2350s (DS9: "Things Past"). This would seem to suggest that Macet's uniform indicates a separate branch of service rather than an older design, but there is no confirmation in episode dialogue to support or refute this. The only other Cardassians seen wearing this type of uniform were from the Cardassian Militia 41. (TNG: "Ensign Ro")
Macet appeared in several of the Deep Space Nine relaunch novels, specifically the Gateway's Deep Space Nine book Demons of Air and Darkness, Unity, and Worlds of Star Trek: Deep Space Nine, Volume 1. The similarities between Macet and Dukat were explained as being due to the fact that they were cousins. However, Macet was a much more honorable man than Dukat. The Pocket DS9 story Fearful Symmetry implies that he grew facial hair as a conscious effort to lessen this resemblance. Macet joined Damar's Cardassian Rebellion and fought against the Dominion – in Demons of Air and Darkness, it was established that he commanded the fleet which attacked Rondac III.
In the Star Trek: Deep Space Nine - Mission Gamma novels, his first name was established as Akellen.
His mirror universe counterpart appears in the novel Warpath and the short story "Family Matters" contained in the anthology Shards and Shadows. He was the commanding officer of the Klingon-Cardassian Alliance vessel Trager during the 2370s.