Three-thousand binglenniums ago, Grand Slam was born. As an infant Slam God, he showed remarkable powers, slamming every object in sight. Eventually, he had to be restrained with slam shackles so that his power did not become uncontrollable. It is said that his slam level was comparable to a Slam God who had been training for several millennia.
However, the Dark Slam Gods, who had been developing slam-portal technology by creating artificial slammers that could slam at inconceivable speeds, found a way to get to Grand Slam and spirit him away under the cover of night. A nine-month period of mourning followed after the Slam Gods realized that Grand Slam was missing.
Then one day, Grand Slam re-appeared in Slamopolis and slammed it into oblivion.