The Deindum were a species who, if allowed time travel, would have rivalled the Time Lords.
The Deindum were made up of the genetic material of over fifty species, including humans. (AUDIO: Resurrecting the Past) They were originally reptilian but evolved to be made of blue/green light. (AUDIO: Escaping the Future)
The Deindum were created when genetic material from over fifty species travelled through a fissure and reacted with primordial soup on the planet Deindus. Every piece of genetic material had some bearing on how the Deindum turned out.
Bernice Summerfield was destined to fall through a portal in time and become instrumental in the creation of the Deindum. Unable to prevent their creation, Braxiatel, with the help of Doggles, planned to turn them into less aggressive creatures by altering the genetic material they would be based on. However, due to the actions of Robyn and Hass, Bernice was prevented from falling through the portal at all, leaving the Deindum a far more aggressive and paranoid species than before. (AUDIO: Resurrecting the Past)
During the industrial age of the Deindum's development, they were contacted by Deindum from the future and were given time travel technology. The Deindum that travelled back began a full scale invasion of the galaxy in order to protect their own history and ensure their creation. (AUDIO: Escaping the Future)
In the 27th century, the Deindum declared war on the universe, beginning what became known as the Deindum War. (PROSE: Adorable Illusion) They first showed themselves to the universe on Maximediras. (PROSE: Present Danger)
Irving Braxiatel and Doggles attempted on several occasions to destroy the Deindum before they evolved into sentient creatures, but on each occasion they were stopped by Deindum from the future. (AUDIO: Escaping the Future)
The Deindum tried to make Deimos and Phobos leave Mars' orbit in the 21st century. Merlin sent Excalibur to Winifred Bambera and Ancelyn in order for them to use the sword to prevent the Deindum's plan from succeeding. (PROSE: Excalibur of Mars)
With time travel, the Deindum conquered the universe and wiped out the human race.
Shortly after they gained the ability to travel in time, the Deindum's biology was altered by Braxiatel to make them a weaker species. Because their appearance was different when the Deindum contacted their past, Bernice Summerfield and Braxiatel manipulated the situation to portray the future Deindum as con artists and a war broke out between the future and past Deindum. The war caused the Deindum to be destroyed at a point before they developed time travel and thus failed to conquer the universe. (AUDIO: Escaping the Future)
Rather than wiping the Deindum out entirely, Bernice Summerfield's actions reduced the Deindum from a set of ultra-savage warmongers to a small set of skirmishers. The war was considered to pretty much won after the the Battle of the Pakhar Shipyards and later the Defence of the Tsarissian Drydocks. (PROSE: Adorable Illusion)