Seeds Sown is the fifteenth and final mission of the campaign. The mission starts on July second, same day as the previous mission. This is a two-on-one mission. Rex and Dr. Ganglion lands on Isla Tantus, Upton Julius' homebase. Julius lands his gyrocopter to greet Rex and a group of creatures surround him. Julius then reveals that since Rex is a product of the original Sigma Technology chamber he will be able to control Rex with it when he's close enough. Julius then tries to control Rex using a remote wired to the original Sigma chamber. However, Rex resists the control, breaks free, and gains control of the surrounding creatures, who chase Julius and Ganglion away.