(W) Dennis O Neil (A) Dick Dillin (CA) Carmine InfantinoBLACK CANARY JOINS THE JLA! When Green Arrows identity crisis inadvertently causes the Leagues darker selves to take physical form and attack, the JLA requires all the help it can get. Luckily, prospective member Black Canary is on hand, having just emigrated from Earth-2but will a new mysteriously acquired ultra-sonic power be a help or a hindrance to her?

BLACK CANARY JOINS THE JLA! When Green Arrows identity crisis inadvertently causes the Leagues darker selves to take physical form and attack, the JLA requires all the help it can get. Luckily, prospective member Black Canary is on hand, having just emigrated from Earth-2but will a new mysteriously acquired ultra-sonic power be a help or a hindrance to her?

BLACK CANARY JOINS THE JLA! When Green Arrows identity crisis inadvertently causes the Leagues darker selves to take physical form and attack, the JLA requires all the help it can get. Luckily, prospective member Black Canary is on hand, having just emigrated from Earth-2but will a new mysteriously acquired ultra-sonic power be a help or a hindrance to her?