World Wrestling Superstars was a group of American wrestlers, doing a tour of Europe in 1993. When Andrzej Supron learned about their shows, he contacted them, which led to the group making a single appearance in Poland. The show was held in Torwar, a sports and music venue in Warsaw.
This was the only international wrestling event held in Poland before WWE arrived in the mid-2010s, and aside from Supron's efforts in the 90s and early 2000s, the only professionally produced wrestling until DDW and TBW held their first shows in 2009-2010.
The "Prehistory of wrestling" article covers this era in more detail.