Bastion is a transforming robot hero introduced in Blizzard's Overwatch in 2016, originally able to shift into a tank configuration for its ultimate ability. Null Sector is the omnic group that serves as an enemy faction in the game's story, giving this version a darker look than the standard hero. Clips of Bastion's musical beeping spread through gameplay videos, montages and meme edits, where fans recognised the tune instantly. The tank call stayed popular after the game evolved because it sums up Bastion's mix of cute personality and heavy firepower in two seconds.