Ryker Zune was the nephew of Dr. Haverson. Ryker was interested in the Bio-Power of the Bionic Rangers and secretly took a prototype Morpher from his uncle's lab. Ryker altered the Morpher into his Alpha Morpher and linked it to the Morphers of the other Rangers to siphon off the excess Bio-Power released when they morphed. When the Morpher was fully charged, Ryker was able to morph into the Black Ranger. However, since his Morpher had a limited power supply, he was only able to be a Ranger for short periods of time. And since they weren't attuned to his DNA, the siphoned Bio-Powers were physically weakening him every time he morphed. Initially, Ryker kept his identity a secret, but when he was injured in a fight, Black Ranger used up all his powers and demorphed in front of the other Rang