After freeing Talia from her father's clutches and escaping from an avalanche, Batman and Robin follow the only clue they have - the word 'Orpheus'. After discovering that 'Orpheus' is Ra's private satellite that will orbit over the Sahara, the duo travel to the Demon's desert stronghold. There, Batman learns that the satellite is actually a weapon which will explosively destroy all the Lazarus Pits simultaneously, throughout the world, destroying all the life that exists. (thetvdb.com)