WRITTEN BY KELLEY PUCKETT; ART AND COVER BY DAMION SCOTT AND ROBERT CAMPANELLA In stores December 11. Batgirl helps Batman hunt for the mysterious killer code-named Alpha. What she finds is a guy with amnesia ? wanted by several gun- running goons of Gotham ? who has planted a nuclear weapon in Gotham City. FC, 32 PG.$2.50 Cover price $2.50.