Big Lizard and Cosima create a fantastic water ride when they dislodge an underwater rock blocking a volcanic vent. It's all good fun until they realise the sea is starting to change.
Cast Appearances

Josh Widdicombe
voices Dad
Mandip Gill
voices D.O.R.I.S.
Lois Sefton
voices Cosima
Dan Chambers
voices Big Lizard
Dan Chambers
voices Other CharactersEpisode Discussion
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