Krohn was a male Zentraedi who had risen to a command rank within the Imperial Zentraedi Forces by the early 21st century. In 2005, his vessel entered into the Earth solar system, which was the projected location of Zor's Battle Fortress - the SDF-1. Upon entry, his ships sensors detected a Reflex Furnace on the fourth planet known as Mars. Feeling that this was the site of the Battlefortress, he dispatched three of his Zentraedi warriors to scout the site. They managed to cripple Mars Base One that was being operated by Humans that had reverse-engineered Robotechnology. However, the arrival of a larger Human vessel forced the scout team to retreat to Lord Krohn. Krohn used his warships weapons to destroy the Human starship and he decided to report the findings of Robotechnology to Dolza h