|Hero Factory Secret Mission 2: Legion of Darkness|
|Hero Factory Book|
|Previous Book||Hero Factory Secret Mission 1: The Doom Box|
|Next Book||Hero Factory Secret Mission 3: Collision Course|
Hero Factory Secret Mission 2: Legion of Darkness was the second Hero Factory book of the Secret Mission series and written by Greg Farshtey. It was released on October 1, 2012.
"When Hero Factory starts making things hard for villains, Black Phantom realizes that the criminals need a team of their own. From every corner of the galaxy, he assembles an army of criminals. Their mission: wipe Hero Factory right off the map.
Outnumbered and out-powered, the heroes Thresher, Von Ness, Stringer, Bulk, and Stormer must come up with a way to win--or else see the galaxy become an empire of crime."
The main events of "Legion of Darkness" take place before the Von Ness mission in Rise of the Rookies. The prologue and epilogue take place after the events of "The Doom Box".
-To be written-
- Furno (present day, prologue and epilogue only)
- Thresher (past)
- Von Nebula (as Von Ness) (past)
- Stringer (past)
The Legion of Darkness
- Voltix (past)
- Splitface (past)
- XT4 (past)
- Toxic Reapa (past)
- Jawblade (past)
- Speeda Demon (past)
- Black Phantom (past)
- On the back cover of the book; Black Phantom's name is mis-spelled as Blank Phantom.