Which ice-cream chain introduced the Blizzard frozen dessert in 1985?

Dairy Queen introduced the Blizzard frozen dessert in 1985.

A Blizzard is a soft-serve-based treat blended with cookies, candies, fruit, or other mix-ins. Dairy Queen serves it thick enough that stores became known for turning the cup upside down before handing it to the customer. The mixing process is central to the product: ingredients are incorporated into soft serve rather than simply placed on top.

The Blizzard was introduced as a major menu item during Dairy Queen's expansion of soft-serve desserts. Its success helped make blended mix-in treats a standard part of fast-food ice-cream menus.

The Blizzard should not be confused with a conventional scoop of hard ice cream. Dairy Queen's version is based on soft serve, and the exact mix-ins differ by country, season, and promotion. The trademarked name belongs to Dairy Queen, even though similar desserts are sold under other names.