The Tokyo Sky Egg (東京スカイエッグ Tōkyō Sukaieggu?) was a 500 meter high tower with a disc-shaped structure with a dome located above the tower.
The Tokyo Sky Egg was used mainly as an auditorium for various shows and spectacles, with a seating capacity of 50,000 spectators. The building has security measures in case of problems. During a earthquake or blackout, the elevators shut down but the emergency stairs leading to the bottom of the dome unlock.
The tower was destroyed during the celebration of Captain Celebrity's farewell party. A villain known as Number 6 attacked the Tokyo Sky Egg with Bombers, flying creatures with the ability to self-destruct. Number 6 aimed to kill Captain Celebrity, but the intervention of several heroes prevented this. In retaliation, Number 6 caused one of the Bombers to self-destruct in a huge explosion that caused the tower to begin to collapse, with thousands of people inside.
Fortunately, All Might averted the tragedy, using his power to land the Tokyo Sky Egg dome safely.