8/8 Chris uncovers the cause of some mysterious holes in the Russian tundra.
7/8 Chris meets a team of oversized rats who save lives by sniffing out landmines.
6/8 Chris explores the mysteries behind a glacier that bleeds red.
5/8 How deadly poisonous frogs can save lives and why we see faces in everything.
4/8 Chris unearths a whirlwind wedding ceremony and a woman with her twin inside her brain.
3/8 Chris Packham reveals a man who gets drunk without touching a drop of alcohol.
2/8 Chris uncovers the secret of suspiciously fishy oil slick.
1/8 Discover the secrets behind the bird-killing solar death ray.