This issue is a variant of Adventure Comics (DC, 2009 series) #2 / 505 [Regular Direct Cover].
Indicia reads: Adventure Comics #2/Adventure Comics #505 (Variant Cover).
Incentive cover shipped in 1:10 ratio to standard cover. Cover is an homage to the cover of Adventure Comics (DC, 1938 series) #300. Lightning Lad inset taken from interior story.
Element Lad's posing as Mr. Janson is revealed in Adventure Comics #8.
The first page previews the cover, while the rest is a preview from one of the chapters in the annual.