Aron and Crosalis were lonely space drifters, transparent and without physical form. Aron turned himself into a train station (Ghost Station 13), so that he could have galaxy train passengers to land and play with his sister Crosalis. The 999 landed on station 13, but was trapped. Aron asked Maetel to provide her psychomagnetic waves (i.e., life energy), so that Crosalis could play with Tetsuro in physical form. Meanwhile, Galaxy Railways decided to destroy the ghost station, and advised the 999 to disembark immediately. The 999 could not escape in time, but Aron and Crosalis intercepted the destruction waves, out of gratitude for Maetel and Tetsuro. (thetvdb.com)