Rann's Agressive Adrift Aliens Antagonize

Rann is well known as the home world of Sardath, inventor of the Zeta-Beam and father to Alanna. Through their efforts at trans-galactic communication with other alien civilizations, they inadvertently transported archaeologist Adam Strange to their planet, where he quickly became Rann's greatest protector. Adam and Alanna, allowed romantic feelings to grow leading to their engagement. Sadly, after each threat to Rann was dealt with by the pair, the Zeta-Beam charge in Strange's body usually wore off. This left him back on the world of his birth, Earth-One.

One one occasion, Adam arrived on Rann-One when the entire human society was threatened by their age-old foes, the blue-skinned Kirri. Thought long extinct following an epic comflict between umans and Kirri, the latter returned from the ice caverns they had hidden in for thousands of years. Utilizing an aqua-ray weaponry attached to their sky-sleds, the Kirri literally liquidated most of the humans, imprisoning them in icy tombs within their hidden base. Strange likewise was immobilized in one of these, but thanks to the intervention of a human dog he accidentally brought with him to Rann-One, Adam freed himself and subdued the Kirri. Later, Rann-One was brought into Earth-One's solar system, before Adam and Hawkman returned it to its native Alpha Centari system.

Earth-Two likewise experienced an appearance by Rann-Two when it appeared in the Sol solar system in  April 1941. The green-skinned Kirri had long conquered the humans of Rann-Two using their special life-stealing ray, which helped prolong their own lives. Seeking to replicate this success by barging cities on Earth-Two with their rays, while riding their sky-sleds, they met resistance from the Spectre. After an initial failure, Spectre was able to finally defeat the once invincible Kirri, imprisoning them.

The Kirri of Rann-One would return under the leadership of invading warlord Kanjar Ro during the Rann-Thanagar War, when they were once more subdued by Adam Strange along with Alanna and their allies Hawkman and Hawkgirl. Another reappearance of the Kirri were later dealt with by Adam and Batman. 

The Kirri of Rann-Two never returned, given their foe Spectre was much more powerful and far less merciful than Strange. However, the humans residing in the city of Rannagar-Two detached from Rann-Two, and would remain in orbit around Earth-Two. Years later on April 1947, it’s inhabitants the Specialists interacted with Spectre's teammate Hawkman. Similarly, the city of Rannagar-One along with its planet once exchanged places with Earth-One, trading places in each other's solar systems due to the Zeta Beam transfer, until Adam Strange and Superman reversed the process.