Prior to bringing on Ray Palmer, Arrow toyed with the idea of doing Ted Kord (the Blue Beetle) instead. They even referenced Tord a few times in the past seasons of Arrow to prepare for his arrival. Unfortunately DC said they had other plans for that character, so the Arrow show runners decided on Ray Palmer instead.
After teasing the costume for a while on the show, DC has revealed Brandon Routh in full Atom costume today. He’ll suit up for the first time on the February 25th episode, and the rumors of an Atom spin-off are picking up even more speed now.