Whenever Professor Murke goes on a research trip, his family thinks he is in Africa or Australia. But that's not true at all! Professor Murke travels through time in a tempo-mobile, exploring long-past geological eras. His journeys are so secret that no one must know about them. Otherwise, someone might come and steal the tempo-mobile! Only his grandson Jonas knows about Grandpa's adventures. In numerous diary entries, Professor Murke recounts his experiences: In the Fog Era, the fog animals consist of millions of tiny rainbow creatures. In the Sugar Age, colorful sugar snails glide through forests of giant lollipops. During the Gloomy Age, the professor was attacked by a frightful creature! In his fantastic time travel, the professor shares stories of fascinating animals that could have existed.