Similar to the Dimensional Robos, it is a mechanical life form that arrives at Cray from another dimension. "CosmoGreat" is the combined form of 5 Elec-Star Beast Machines.
It is an expert in mid to long range combat. Its sturdy and bulky armor can almost nullify damages from long range attacks, and it annihilates its enemies with the Particle Beam bombardment attack "CosmoBlast", which boasts in its tremendous power.
It does not belong to any organization before it came to Cray, and because it doesn't have anyone that can be called a comrade, the 5 Elec-Star Beast Machines has always been fighting alone.
Because of that it acts surely and is very sarcastic, but it is a dependable warrior that will surely rush to its ally's aid whenever they are in danger.