Cale Qualto was born on Mantooine in 17 BBY. He was raised on a farm, where he worked constantly with his father. In 8 BBY, he was taken from his home along with fourteen other boys his age by the Empire, to be trained as elite soldiers. He was placed in the Scout Trooper division of the Stormtrooper Corps.
After a few years as a Scout Trooper, Cale trained for and joined the Storm Commandos. His skill and expertise in this division of the Stormtrooper Corps attracted the attention of Imperial Intelligence. He spent several years undercover, ferreting out Rebel cells and eliminating critical leaders for the Rebellion. He personally performed eighteen assassinations. Later, he was recruited as part of Imperial Intelligence's ongoing rivalry with the Imperial Security Bureau; he assassinated several prominent Imperial officials with traitorous leanings.
At some point during this time, his DNA was sampled and used to create a human replica droid of him. Sometime after this, he became disillusioned with the Empire and resolved to defect.
Eventually, he got his chance. Because of his earlier expertise, he was placed in a Scout Trooper unit on Talasea, guarding the planetary governor's palace. Intel suspected that a traitor was involved in an assassination attempt on the governor, but Cale did not stay on-task long enough to discover whether or not this was the case. He went AWOL and then underground.
He worked as a pirate and a mercenary for many years. Around 15 ABY, he worked with Aiden Allston, as well as a former Navy officer and a former Spacetrooper, as a mercenary. Since that time, he has again disappeared into the woodwork, hiding among the Galaxy's many occupants.