There are many things fans love about Star Trek: Deep Space Nine, a series that had to fight for its reputation like Captain Sisko against the Dominion. Along with new and legacy Starfleet characters, the space station was filled with familiar and fresh alien species. However, the station's Ferengi bartender is perhaps the series' most important one. Quark wouldn't exist as he does had actor Armin Shimmerman not made a huge mistake when he played the first Ferengi character on Star Trek: The Next Generation.
Source：https://www.cbr.com/star-trek-ferengi-mistake-armin-shimmerman/
