The Second Great and Bountiful Human Empire was a political entity with influence in three galaxies, known as the Tri-Galactic.

The Second Empire flourished from a small Earth colony at the far edge of the galaxy. One of its worlds was Dephys 49. (PROSE: Vortex of Fear)

By the 39th century, the same time that the Galactic Federation also existed, (PROSE: Legacy) the Empire reached the Ood Sphere and enslaved the Ood. (TV: Planet of the Ood)

By 3999, Earth had many enemies including Beaus, Malpha, Zephon, and the Eminence Gris. The Empire's key to power was the Great Clock on Earth which served as a counter-weight for hyper lanes, guarded by the Guardian of the Solar System, Mavic Chen. When the Clock was destroyed, (AUDIO: The Guardian of the Solar System) Chen joined the Outer Galaxies in the Great Alliance with the Daleks to destroy Earth, planning to betray them. The plot was defeated, however; Chen was killed, and the Outer Galaxies and Earth turned against the Daleks (TV: The Daleks' Master Plan) beginning the Great War. (PROSE: The Evil of the Daleks)

By the 42nd century, it had spread from an overcrowded Earth throughout the Mutter's Spiral, the Andromeda Galaxy, and another galaxy. The currency of the Empire was the credit. A revolution on the Ood Sphere in 4126 resulted in the slave trade being abolished. (TV: Planet of the Ood)

One of the farthest reaches of the Empire was Agelaos. (PROSE: The Weeping)

At this time human colonists were fighting the centaur-like Aquabi on the planet Rescension. (AUDIO: Pest Control)

The Second Empire, which had become cruel and oppressive, was overthrown by the New Protectorate, led by the Virgin Lady High Protector. (PROSE: Tomb of Valdemar)

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