The Doorway of the Elder Ones is a fictional item in the G.I.Joe universe which first appeared in 2012 in the 1st issue of the 1st volume of Infestation 2: G.I.Joe.
The Doorway of the Elder Ones is a statue which opens doorways to other places, freeing those whom should not be freed. The worshipers of the Old Ones come through as a song, making those who are sane less so. Transforming all those who hear the song. Across the planet are number of those doorways. To bring the Elder Ones to Earth, all of the doorways on Earth have to be opened.