Just after a return trip from somewhere in time, Doc Brown's Mr. Fusion malfunctioned and blasted him with a heavy but non-lethal dose of thalaryon radiation. Although he will survive the exposure, the thalaryon zoomies have left him temporarily megalomaniacal and paranoid/schizophrenic.
During his present compromised mind-state, he found that while he was away from present time, many Atlanta geocachers had used his ultimate invention, the flux capacitor, to gain advantage in finding FTFs, alter history, reset old comic strip timelines and try to get dates with former Miss Americas.
Doc Brown's anger could be vented towards one and only one person…
"That stupid Hokuri!" he screamed. "And he dares to call himself a 'chemical engineer'! You know what a 'chemical engineer' is? He's a person who doesn't know enough chemistry to be a chemist and doesn't know enough engineering to be an engineer!"
And with that, temporarily insane Doc Brown began to laugh hysterically.
Hokuri, of course, went into self-imposed exile. He was last seen at an undisclosed Outback Steakhouse bar with Elvis and Salman Rushdie, the three of them tossing back ice-cold brewskis.
Doc Brown proceeded to put together a puzzle to draw Hokuri out of hiding:
Good luck
You can check your answers for this puzzle on GeoChecker.com.