Following up a tip from Geezi the Pedulonan alien informant, the Galaxy Rangers visit the great domed Tortuna City on the outlaw planet Tortuna. They seek one of the Queen's precious memory birds. These birds hold data concerning top secret operations of the Queen. Instead of acquiring the real memory bird, Geezi slips the Rangers a fake bird programmed with simple bubblehead memory. The Rangers go after the real bird and in the process they aid Geezi in smuggling the last survivors of the Girkin race off Tortuna. The Queen has converted almost all the other Girkins into psychocrystals to power her Slaver Lords.