Green Lantern Vol. 4 #44

"Blackest Night” continues! As Hal Jordan and Barry Allen investigate a bizarre crime in Gotham City, they come face to face with one of their oldest allies – J’onn J’onzz, the Martian Manhunter! But their old friend is not there for reunions; he’s come for much more. Meanwhile, Sinestro seeks to rebuild his army and take his revenge on the being who would usurp it – Mongul!

(NOTE: Although the solicit by DC says Mongul and Sinestro appear in this book, they do not)