The Adventurers land near Tyuratam, Russia in 1961 where The Hacker's Agents are plotting to stop the first manned space flight. The kids meet young Alexi who leads them through an underground labyrinth to the launch pad. Overjoyed and excited at meeting the famous Cosmonaut Yuri Gagarin, they barely notice that he is really one of the Agents. Will there be enough time left to find the real Yuri Gagarin?