The special stars actor Piet Klocke as a rather confused professor, explaining the theories behind Sesamstrasse with the help of archive material. Meanwhile, all the street inhabitants including Samson, Tiffy, Finchen, Buh, Rumpel, Bettina and Jivana get ready for the party. As a surprise finale, singer Blümchen performs "Sesam Jam (Der, Die, Das)," with the cast. Actor Rolf Zacher also appears.