Kro (species)
From Tardis Wiki, the free Doctor Who reference
The Kro were a crocodilian species which originated on a swamp planet.
In 1560, the Kro were fighting a war on their swamp planet between long-snouts and short-tails.
Around 400 years later, they discovered space travel, forming the Phalanx of Kro.
The Kro later became clients of the Poldagon science facility which hosted faux invasions on their planet. Specifically, they practiced their invasion on 1560 Earth. During this time they encountered the Seventh Doctor. (AUDIO: The Doomsday Quatrain)
