The eleventh starship to be called Enterprise with the registry NCC-1701 is depicted in this episode, although the ship's class is not mentioned. Ships named Enterprise that do not have this registry and are not counted include the OV-101, XCV 330, and the NX-01.
Many of the ships in the Battle of Procyon V are reused studio models from throughout the various series. Among those that can be clearly identified are Vor'cha-class, Prometheus-class, Nova-class and Dauntless-class starships, as well as the Vissian starship and Devore warship standing in for the Sphere-Builders.
Scott MacDonald has appeared in all of the Star Trek television spin-offs. His most frequent Star Trek role was that of the Xindi-Reptilian, Commander Dolim during the third season of Enterprise. He has also played the roles of Tosk on Captive Pursuit (1993), Goran'Agar on Hippocratic Oath (1995), Sub Commander N'Vek on Face of the Enemy (1993) and Ensign Rollins on Caretaker (1995).
Josh Drennen originated the role of Thalen in Proving Ground (2004). He reprised the role in Stratagem (2004), but was replaced by Christopher Goodman for the character's appearance in this episode.