Doctor Chen (Wain Wang)

"A brilliant scientist with unsurpassed genius in the field of robotics. Because of his innovations, he was made head scientist of the Federation lab, but was later put on their watch list for unauthorized experiments with DX2 technology."

- Description of Dr. Chen by Kelly from Episode 18

Dr. Chen is a brilliant scientist, capable of hacking most systems and deciphering the Gigantor's codes.

Wain Wang disappeared about 20 years before the show's starting point. At the same time, Dr. Chen began building illegal combat robots for underworldly purposes.

When Scar attacks the Federation's mobile base in ep 18, this DX2 technology is found in his body, presumably in the form of the new enhancements to his combat sensors he had acquired from Dr. Chang in the previous episode.

Dr. Chen was able and stole The General's mechanical heart from it's vault in the federation sometime before episode 18.