Mark 4 energy level was a measure of energy used as reference by members of the Aegis, indicating an advanced level of technology. In 1968, Gary Seven discovered technology being used by a Soviet spy ring utilizing energy levels at mark 4, "hundred of years ahead" of 20th century Earth. (TOS - Star Trek: Assignment: Earth comic: "Brighter Than a Thousand Suns") Seven later discovered this technology had been provided by the group Counter Strike. (TOS - Star Trek: Assignment: Earth comic: "We Have Met the Enemy...")

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