Identity

Kugo recieves a transmission from her supposed sister, Lasha, who says she is in trouble on Romulus. Taking a Runabout there, she encounters Lasha and Lasha's associate, Tey, who are not actually related to Kugo by blood... but rather by an oath of assassins. With the crew of the Phoenix-X following closely behind, Kugo begins to admit that she isn't Vulcan at all.

Links
Episode 21 - "Identity"