Crystal Jacks

The Crystal Jacks are antagonists in the Samurai Jack Comic series.

Comics
After Aku sent a sleeping Samurai Jack in a pod to a crystal cave, he saw crystal reflections of himself that ultimately turned into actual beings that tried to fight the real one, but they were all destroyed and later all merged into one new being witch fought Jack and caused a cave-in but was crushed.

Abilities
The Crystal Jacks would fight the same way the real Jack would. They can also merge after being cut in pieces.