Release Message:  One day, the youngest of four boys finds a fossil of trilobite. So his older friend takes him on journey through prehistory, up to the beginning of time, to see real live trilobites. Directed by Karel Zeman.

Description:  For Czech version: One day, the youngest of four boys finds a fossil of trilobite. So his older friend takes him on journey through prehistory, up to the beginning of time, to see real live trilobites. 1955 Czech Original Version 1966 US Dubbed Version with additional footage The story involves four teenage comrades who take a rowboat along a "river of time" that flows into a mysterious cave and emerges on the other side onto a strange, primeval landscape. The boy actors were Josef Lukà_ (Petr, the main narrator), Petr Herrmann (Tonik, who also narrates in part), Zden k Hustàk (Jenda), and VladimÕr Bejval (Jirka). As they make their way upstream, they realise that they are travelling progressively farther back in time, and facing various perils as they do so (but learning much about prehistoric life in the process).