Deindum

The Deindum were a species who, if allowed time travel, would have rivalled the Time Lords.

Biology
The Deindum were originally reptilian but evolved to be made of blue/green light. (BFBS: Resurrecting the Past, Escaping the Future)

History
Irving Braxiatel and Doggles attempted on several occasions to destroy the Deindum before they evolved into sentient creatures, on each occasion they were stopped by Deindum from the future.

Bernice Summerfield discovered that during the industrial age of the Deindum's development, they were contacted by Deindum from the future and were given time travel technology. Shortly after gaining the ability to travel in time, the Deindum's biology was altered by Braxiatel to make them a weaker species.

With time travel, the Deindum conquered the universe and wiped out the human race.

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 Diendum. The war caused the Deindum to be destroyed at a point before they developed time travel and thus failed to conquer the universe. (BFBS: Escaping the Future)