Recommended Reading Order

The HUniverse is a big place.  Fortunately (unlike some other comic events) HUniverse stories are written so you don't need to read everything to understand what's going on.
However, if you do want to, this is a guide to reading HUniverse titles in the order that makes most sense.
Time 	Comic 	Reason
Pre-Heroes Unite #1 	
Hellfire  (sadly no longer available) 	Introduction of Hellfire
Pre-Heroes Unite #1 	
Acrobat - Issue #1 	Introduction of Acrobat
Pre-Heroes Unite #1 	Energize Series 1 - Issues #1-3 	Introduction of Energize
Heroes Unite #1 	Heroes Unite - Issue #1 	Introduction of Heroes Unite
Pre-Heroes Unite: Cavalry	Bombshell - Issue #0 	More about Bombshell
Pre-Heroes Unite: Cavalry	
From Comet Kid: Team Players to Comet Kid: Shooting Stars	Introduction and Origin of Comet Kid
Pre-Heroes Unite: Cavalry	Acrobat - Issue #2 to Acrobat: Plot Twist and Tech	Introduction of Plot Twist
Heroes Unite: Cavalry 	Heroes Unite: Cavalry