Fantastic Four

The Fantastic Four was the first super hero team to be formed within the Marvel Universe. It's founding members were Reed Richards (Mr. Fantastic), Susan Storm (Invisible Girl), Johnny Storm (Human Torch), and Benjamin Grimm (The Thing).

History
After being bombarded with cosmic rays during a trip into space, Reed Richards, Susan Storm, Johnny Storm, and Benjamin Grimm were accidentally bestowed super powers as a result. Deciding to use their super powers to protect and defend the world, the group donned code names, costumes, and formed a super hero team called the Fantastic Four.

Headquarters
The Baxter Building