Bring on the Bad Guys: I

Real name: I

First appearance: Justice League of America I#27 (May 1964)

Abilities: Teleportation 

Worst act: Disbanding the Justice League

Quote: "I have brought you to me because-though you have been unaware of my existence until this moment--you are my mortal enemies!"

Created by: Gardner F. Fox (script), Mike Sekowsky (pencils), Bernard Sachs (inks) 

Full roster this time out. 

The League gets letters of distress from Bruce Wayne, Ray Palmer, and someone named C. King. Naturally Batman, the Atom, and Aquaman (guess who) are a bit baffled as none of them are in danger. To try and figure it out, Batman joins Flash, Snapper Carr, and Green Arrow as they investigate some robberies. 

The Martian Manhunter and Wonder Woman are joined by the Atom as they investigate a mysterious cannon. 

Aquaman, Green Lantern, and Superman check out a mysterious island. 

From their different locations, the entire team is then captured by I. The reason? It seems the JLA is too successful and their success factor is drawing power away from I, thus killing it. 

I is able to drain of their success thus making them unable to team up. Snapper remembers they have Amazo in storage and power him up. He easily beats the heroes down and this somehow sends feedback to I and kills it. 

Strange yarn. Not as crazy as it could be, but weird overall.