The original Parademons were created at the behest of Darkseid. He had the first Parademons genetically engineered in the laboratories of Apokolips, and then sent to Granny Goodness, who instilled in them an interminable sense of loyalty to Darkseid, as well as a mindless desire to obey his will. Darkseid organized these newly-created soldiers into ranks with the intention that they would serve as his shock troops, personal soldiers and sentries of Apokolips, a role which they have occupied ever since.
In recent continuity, Darkseid's Parademon horde's are brought to a much more sinister light. During various invasions across parallel earths, it is revealed that Apokolips generally creates it's more cybernized pawns using the cadavers of the various species they decimate for raw material. Converting both living sentient's along with their dead tissue samples into zombie-like hunter-killer drones, mass produced from the remains of the conquered dead of their target worlds quarry.
The Parademons were created by Jack Kirby.
Major Story Arcs
In most story arcs, Parademon troops are used as the advanced force for invasions or battles. They are also used as multi-purpose backup or retrieval units, who are utilized for a number of plot-related tasks, such as capturing or pursuing people, retrieving important items, or putting down rebellions on Apokolips.
Powers and Abilities
Parademons power is overwhelming. They possess superhuman strength and endurance, and have been shown to have a high threshold for pain. They are not particularly intelligent, and most appear to have rudimentary or nonexistent communication skills, though a few have developed the ability to talk. Most also lack a concept of self-awareness or self-determination, and are largely unthinking slaves to Darkseid's will. They tend to rely on sheer volume to overwhelm opponents, and are rarely encountered on their own. Despite this, they are ruthlessly efficient and experienced soldiers. They have access to Apokaliptan weaponry, and all Pardemons are fully versed in their use. They are also capable of flight via the standard-issue Apokaliptan armour that all Parademons wear. Within recent publishing they've show to come in new shapes and forms, with all new powers as well, Parademons are more bionic than organic now. Ergo they have an ability to technoshift at will, growing new mechanical appendages for expedient travel or cybernetic wings for flight. Said extremities also serve as melee weapons; e.i. the wings act as arazor blades that can even cut through a Lantern Ring's protective aura. They can also discharge a primordial fire from their mouths as a form of offense and self-destruct in order to cover their tracks, intent on taking any opposition to their mission directive along with them in the process. A unique, stronger class of Parademon called Berserkers have shown the special capacity of carrying a form of techno-organic virus which can instantly convert another person or creature into whole new Parademons.
Parademons appear in their traditional role as soldiers on Apokolips in the Marvel and DC jointly released series JLA/Avengers.
In Other Media
The Super Friends:
Parademons, going by the parent-friendly name "para-drones," appear in a number of episodes of the Super Friends series, making their first appearance in the season nine episode "The Seeds of Doom"
The Parademons made their first appearances in the DCAU in Superman: The Animated Series, featuring in both parts of the two-part episodes "Apokolips... Now!", "Little Girl Lost" and "Legacy". They make their next appearance in the second season Justice League episode "Twilight (Of The Gods)", and in the Justice League Unlimited episodes "The Ties That Bind", "Alive", and "Destroyer!" In all of these episodes the Parademons played a role identical to the one they occupy in the comics.
Batman: The Brave and the Bold:
Parademons appear in their traditional role in the episodes "The Knights of Tomorrow!" and "Darkseid's Descending" in which they work as backup for Kalibak and in the force that invades Earth.
Superman/ Batman: Apocalypse:
Parademons make an appearance as soldiers on Apokolips.
The Parademons are set to make an appearance within the new Justice League live action movie, serving as the advance forces of Steppenwolf's invasion. In a dream sequence during the BvS movie; Bruce Wayne reminisced of a horrendous dystopian world ruled by Apokolyptian forces. A rebel outpost he lead had been breached by a Trojan Horse like infiltration tactic and was quickly overrun by an army of Darkseid's forces.
Justice League Heroes:
Parademons appear as antagonists that the player must face before taking on Darkseid.