For years, Milwaukee TV viewers have seen commercials for Sonic Drive-In restaurants and wondered "What's that all about?"

The answer is coming soon.

Sonic plans to open 20 restaurants in the Milwaukee area, with the first slated to open Feb. 24 at 2080 Miller Park Way in West Milwaukee.

Based in Oklahoma City, Sonic operates 3,500 drive-ins coast to coast. The chain, which features carhop service (often from servers wearing roller skates), specializes in fast food items like burgers, hot dogs, onion rings, tater tots and frozen and fountain treats. Sonic also serves breakfast items.

Sonic is famous for drinks with different flavors. The store says there are 168,894 possible combinations ranging from Ocean Water (Sprit with blue coconut flavoring) or Limeade (Sprit with lime and other flavors).