Though not related to Earthlings, the Valkyria bare a remarkable resemblance to Earthling females. Tall, Statuesque, and blonde, the Valkyria resemble Earthlings of Scandinavia stock. All Valkyrians in Slipstream are female, though their race originally had two sexes. Males were subservient to females, and performed only menial tasks. Leaders, academics, engineers, and warriors were all female.
Valkyrians in Slipstream are all members of a large battle group sucked through a black hole. Without males they thought their race doomed, until they discovered Earthlings, with whom they are genetically compatible. The Valkyrians never claimed a home world. They lived aboard huge mother ships, and it is when flying a rocketship that the valkyrians feel most comfortable.