A new artistic troupe, the Heroes, went on stage last night, presenting a novel form of entertainment. Comprising up-and-coming actors and singers, the group combines satire, dance and song in a show developed exclusively by Eleni Gasouka. Billed as a Balkan cabaret touching on theater review, the interactive performance counts on audience participation and is based on the idea of artistic subversion. These are the Heroes: Antonis Loudaros, Giorgos Kormanos, Giorgos Symeonidis, Magda Pensou, Thanassis Alevras, Maria Manioti, Tassos Pyrgieris, Vicky Kyrou and Manolis Lidakis. Zygos, 22 Kydathinaion, Plaka, tel 210.324.1610/71. Performances on Mondays and Tuesdays at 9.30 p.m.