Susanna Thompson
The most important thing to know about Susanna Thompson is this; if there is a major cable network crime show franchise, she has probably guest-starred in it. Her list of credits includes, but is not limited to: The X-Files, Law and Order SVU, Cold Case, Without a Trace, The Twilight Zone, CSI, and L.A. Law. As a result, she has a tendency to cause Hey, It's That Guy! moments.
She is also a Star Trek veteran, and is one of only a handful of actors to have guest-starred in all three 24th-century Trek shows - Star Trek: The Next Generation, Star Trek: Deep Space Nine (as Lenara Kahn, a love interest of Dax and a participant in the first same-sex kiss in franchise history), and Star Trek: Voyager (as the Borg Queen, taking over for an unavailable Alice Krige).
Her most famous roles are Lt. Col. Hollis Mann on NCIS, the Borg Queen in Star Trek: Voyager, Queen Rose Benjamin in Kings, and Karen Sammler on Once and Again.
She has also received awards for her work on the San Francisco stage, including roles in A Shayna Maidel and Agnes of God. And she happens to be very good at stage combat.