Gamma Alpha V was a class M planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, the fifth planet in orbit of the Gamma Alpha star system.
Gamma Alpha V was explored by a robotic probe in the 2250s. The probe found the planet to be class M, but with no inhabitants.
The planet was colonized by Alexander Lazarus and a number of android replicants he had built, which had all been imbued with the thoughts and memories of a significant figure from Earth's history.
In the mid-2260s, on stardate 10:26.3, the Federation starship USS Enterprise explored the planet, meeting George Washington among others, before Spock was kidnapped by Lazarus, who wanted to use his brain to create a new series of androids based on Vulcan history. The ensuing conflict led to the destruction of the planet, in an explosion whose shockwaves shook the escaping Enterprise. (TOS comic: "The Legacy of Lazarus")