Sometimes in summer

Igor Ilyinsky

Teleskop / professor Sen-Verbuda

Leonid Kmit

Zhora

Ivan Koval-Samborskyi

agent ugolovnogo rozyska

Yevgeny Gurov

zritel'-assistent na predstavlenii

Ivan Tverdokhleb

cooperator

Antonina Savitskaya

Fenichka - plemyannitsa professora

Grigori Dolgov

zaveduyushchiy klubom

Lev Ivanov

(uncredited)