Reflecting the rivalry between the two main characters [[Yusei Fudo]] and [[Jack Atlas]], "[[Stardust Dragon]]" and "[[Red Dragon Archfiend]]" are the only "Signer Dragons" to have different upgraded versions. It is worth nothingnoteing, however, that "[[Life Stream Dragon]]" has its downgraded, armored version, "[[Power Tool Dragon]]", which is a required [[Synchro Material Monsters|Synchro Material Monster]] for its Summon.