Justice League Assemble

"What kind of spaceship is that? Are aliens coming to Earth again?" The Flash stood up, staring intently at the spaceship that had appeared on the screen. The Watchtower's radar had detected a rather dilapidated-looking saucer-shaped spaceship suddenly jumping out of space near Jupiter, roughly 630 million kilometers from Earth. The Flash had encountered other alien enemies and friends both before and after the Justice League was established. Superman was the most famous alien of them all—a Kryptonian.