How I Met Your Philosopher

The year is 1999. A very serious prophecy is spread around the globe saying that the Doxa, an evil supernatural mafia, would take over the 21st century. Scientists got so scared about the new millennial that they created a time machine and summoned the greatest Western philosophers back on Earth in order to fight the Doxa.
19 years later, the Doxa wins its first fight: it is finally time for the scientists to call on the philosophers for help. But there's a catch: they were all reborn as ordinary American kids and have no memory of their previous life...