OverCharge Delirium XT

 is the drink responsible for the propagation of the Overcharge Mutants in Sunset Overdrive.

Summary
OverCharge Delirium XT is an energy drink shown during the E3 reveal video. The drink is marketed by Fizzco, a multi-national sports drink conglomerate. The drink was announced along with a United States tour, starting first in Sunset City, before moving on to planned visits to Los Anglees, San Diego, Cologne, and Seattle.

In-Game Lore
The reveal at Sunset City was teased in an online advertisement with the following text:

''Want to be among the first to suckle on OverCharge? Yes, you do. Fizzco is bringing its earth-shaking new energy drink to its hometown citizens before anyone else! Get down to some wicked dope beats, win free Fizzco Wearable Advertisements, and indulge in all the OverCharge your body can handle. If you miss it – you'll be missing out on life itself.''