Pablo and Splash: Frozen in Time by Sheena Dempsey

Pablo and Splash go to visit Professor O'Brain in her lab, only to find that their friend has been left behind in the Ice Age by her misbehaving time machine.

The brave penguin buddies set out on a rescue mission – destination 68,000 years ago! When a Neanderthal man accidentally wanders into their time machine, it's not just the professor who is stuck in the wrong time period. But luckily a scientific breakthrough for Pablo combined with Splash's endlessly upbeat approach to life can save the day!