Deadly 60 presenter Steve Backshall is used to being up close and personal with some of the deadliest animals in the world.
But even he was taken by surprise when a group of Komodo dragons he was filming turned their interest from hunting food to them.
The dragons were relaxing when the crew placed chunks of meat near them to lure them out.
A group of around 15 of the animals chased the crew but no-one was hurt.
In an interview afterwards, Steve said "I've been out to Komodo four times and it's always been about how they catch other animals; but this time the change in their behaviour was extraordinary and it was genuinely frightening."
When asked what the dragons could have done to the crew if they had caught up with them, he said: "They're the largest genuinely venomous creature on Earth. This is an animal which could take down a water buffalo which could weigh between 300-400 kilos.
"It's a seriously threatening animal."
The new series of Deadly 60 is on CBBC from Monday 26 March at 7.30am and 4.30pm.