Th'twirirl was a Ssi-ruu who participated in his species' foray into the galaxy to find new subjects for entechment. During this time, he served as Unit Commander in the Ssi-ruuvi Imperium when he was attached to the landers that assaulted the planet G'rho. He was present during the capture of the young Dev Sibwarra who Entechment Chief Yifaii intended to discard. However, Th'twirirl decided instead to pass the youngling to Yifaii's assistant Firwirrung.