At the Theatre, the audiences could witness actors such as Kazimierz Kamiński, Ludwik Solski, Maksymilian Węgrzyn, Antonina Hoffman, Wanda Siemaszkowa, Stanisława Wysocka and Aleksander Zelwerowicz. Theatre artists like Juliusz Osterwa and Kazmierz Junosza-Stepowski began their careers at the Słowacki Theatre, and Helena Modrzejewska made numerous guest appearances. During the interwar period, the theatre was overshadowed by the Warsaw theatre scene, but still it was considered to be one of the most important stages in Poland. In 1980 the Słowacki Theatre staged the world premiere of Pope John Paul II "Our God's Brother" (""), a production whose significance was above all political.