In
episode 14, Rei calls
the entry plug as the throne of the soul. Her description of the entry plug is quite
appropriate since it is through the Entry Plug that the Evangelion pilots enter the body of the Evangelion. The entry plug
is filled with the liquid called LCL and the
pilots control the Evangelion
through thought and through operating two control sticks which responses to the Evangelion unit's hands.
The entry plug is located at the back of an Evangelion unit.