Helena Dvořáková

as Laika (voice)

Karel Zima

as Yuri Leftkin (voice)

Petr Čtvrtníček

as Queerneck (voice)

Jan Vondráček

as Ham / Cow (voice)

Miroslav Táborský

as Neil Knockout (voice)

Robert Nebřenský

as Professor Vorolev / Pig (voice)

Jan Budař

as Assistant Tossoff (voice)

Martin Matejka

as Younger Knacker / Professor Tossoff (voice)

Vladimír Merta

as Older Knacker (voice)