The Legion #27

Brainiac 5 and Invisible Kid are unable to stop the invaders at the Time Institute, so Invisible Kid follows them out through their Boom Tube, while Brainiac 5 stays behind to deal with the bomb they left. After the Legion cleans up at the Time Institute, Brainiac 5 determines that the universe is shrinking. Invisible Kid explains this phenomenon, when he determines that the dark figures are sucking the dark matter out of the universe. The Legion rushes to help Invisible Kid and learns that the dark matter being gathered by thousands of stargates is being shunted into a giant Boom Tube.