The so-called 'Anti-Matter Man' possessed vast power, incuding superhuman strength, invulnerability and the power to walk the pathways between positive matter dimensions at will.
After Anti-Matter Man discovered the positive matter universes Earth-One and Earth-Two, he decided to investigate them. He felt no empathy at all for the living beings populating these universes, and remained either blissfully ignorant or arrogantly unconcerned to the fact that his presence endangered them.
Ultimately, the Anti-Matter Man's threat was ended by the combined forces of the Justice League and Justice Society. They halted his progress before any long-lasting damage could be done, and the power of the Spectre banished him back to his anti-matter universe.
