For Lady Vorkosigan, see Ekaterin Vorkosigan.

Kat was part of the engineering crew of the fast cruiser Ariel during the Tau Verde Ring war. Employed by the Oseran Mercenaries, she defected to the then-fictional Dendarii Mercenaries after the Ariel was captured by Miles Naismith. Given the rank of trainee, she took part in a Dendarii boarding operation that captured an abandoned Pelian warship rigged to self-destruct. Kat, another engineering tech, and Naismith disabled numerous armed dandelion bombs, saving the captured ship and their own lives in the process.