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Phase One is a sidequest in South Park: The Stick of Truth.
Go see the Underpants Gnome in your room to activate the quest. You need to collect five underpants for the Underpants Gnomes. The reward is a Underpants Gnome friend request. The underpants can be collected before the quest is given.
Underpants Are Found At:
- Cartman's bedroom
- Kyle's bedroom
- Stan's Parent's bedroom (Opposite from Shelly Marsh's bedroom)
- Stan's bedroom
- Kevin's bedroom