Fan Casting Supergirl

A story of supergirl Finding the corpse of a braniac sentinal (which she remebers as being a hivemind andriod on her home planet of krypton) with a 4 on its chest but it is wearing a gold ring with an L on it but when she puts it on out of intrigue she gets transported to the 31st century at the first audition for the LEGION OF SUPERHEROES where she is informed by the small group of legioners bouncing boy lightning lad Saturn Girl and the leader Cosmic Boy that someone is going round killing superheroes and after creating an upgraded android called braniac 5 they find out who is the murderer who turns out to be lighting lads brother lighting lord this is a futuristic superhero crime thriller with a cameo at the audition from bart allen the grandson of barry allen the flash as impulse.