|“||Nguyen is Errinwright's creature. They're in this together.||„|
|— Lt. Shaffer|
Lieutenant Shaffer was a member of the United Nations Navy who served as the Executive Officer (XO) of the UNN Agatha King. She partook in an ill-fated mutiny attempt against Fleet Admiral Augusto Nguyễn, where she was loyal to Admiral Michael Souther; she was later killed in an attempt to re-take CIC.
Throughout the series
In "Assured Destruction", she is surprised why the Agatha King was sent to recover the drop ship skiff and suspicious when Admiral Nguyễn announces he will personally rendez-vous with Souther's ship in order to interrogate the prisoner they would recover from the drop ship. She helps distract the guard so Souther can secretly access and interrogate Cotyar.
She detains Lt. Boyer and Admiral Nguyễn when Souther charges Nguyễn with conspiracy to wage an illegal war; however, she doesn't cover them well enough and ends up allowing Nguyễn to assassinate Souther. When Mancuso initiates another attempt to retake the Agatha King, she breaks Boyer's neck but ultimately fails when Nguyễn won't fall but instead lands a return shot. As she tries to crawl away, Nguyễn finishes her off.
|1 "Fight or Flight"||Absent|
|3 "Assured Destruction"||Appears|
|5 "Triple Point"||Appears|
|8 "It Reaches Out"||Absent|
|10 "Dandelion Sky"||Absent|
|11 "Fallen World"||Absent|
|13 "Abaddon's Gate"||Absent|
Although Shaffer is referred to as having the rank of "Lieutenant", both her rank insignia and position as executive officer make it more likely that she is a Lieutenant Commander.