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Chimeratech Overdragon
This monster cannot be Special Summoned except by Fusion Summon. When this card is Fusion Summoned, send all the cards on your side of the field to the Graveyard except this card. The original ATK and DEF of this card become the number of Fusion Material Monsters you used for the Fusion Summon of this card x 800 points. This card can attack as many of your opponent's monsters each turn as the number of Fusion Material Monsters you used for the Fusion Summon of this card.
Five-Headed Dragon
The Fusion Material Monsters for this card are any 5 Dragon-Type monsters. This monster cannot be Special Summoned except by Fusion Summon. This card does not take any Battle Damage and cannot be destroyed by battle with an EARTH, WATER, FIRE, WIND, or DARK monster. (Battle Damage is still inflicted to players.)
Cyber-Stein is a not a Fusion Summon. He can't Summon those monsters.