Tanis Reynard was one of the dangerous prisoners on the prison ship Sebrus that overpowered its crew and guardians and killed most of them. The Sebrus crashed on P2X-005 in 2000 and they were stranded for three years. They fought the rest of the surviving crew including Captain Warrick Finn.
When SG-1 arrived in 2003, they agreed to help them power the Sebrus. When SG-1 discovered that they were escaped prisoners, they captured them and handed them over of Warrick. She was eventually, along with Aden Corso and Lyle Pender, transported to prison with the restored ship. (SG1: "Forsaken")