Xindi-Reptilians resemble a cross between several Earth lizards. This species is responsible for a preemptive attack on Earth in 2153. Aided by trans-dimensional beings, the Reptilians also traveled to 2004 to collect blood samples for their bio-weapon in the future but were foiled by Jonathan Archer and T'Pol. Reptilians prefer to be low to the ground, as opposed to high-rise buildings. They use weapons with regenerative biometric power cells that overload if another species tries to use them. They use thermal chambers on board their ships to keep their energy. They are the most aggressive race of Xindi and seem to be more interested than the other races in destroying Earth. The military leadership of the Reptilians appear to be obsessed with eugenics. The Xindi-Insectoids are the race that the Reptilians are closest to. Along with the Insectoids, they are responsible for the destruction of the Xindi homeworld. The attack squadrons seen at Azati Prime consisted of two Reptilian ships and two Insectoid ships. Commander Dolim was the Xindi-Reptilian representative on the Council.