The Irwins travel to South Africa, where Terri helps release a wild leopard, Bindi learns from the all-female anti-poaching squad The Black Mambas and Robert attempts to photograph Africa's big five game animals.

The family makes the annual trip to the Steve Irwin Wildlife Reserve to capture, study and release wild crocodiles, a mission started by Steve and Terri that provides research vital to the protection of Australia's apex predators.

After months of croc wrangling training with Steve Irwin's best friend Wes, Robert, Steve's son, takes the final step in his journey to feed Graham, a huge crocodile at the zoo's famous Crocoseum.

The family prepares Croc One, Steve Irwin's research ship, for a mission to release an endangered sea turtle back to the wild; Scarlett the giraffe reunites with her grandmother; Grub the wild echidna is released from the Zoo's Wildlife Hospital.

The Australia Zoo's alligator snapping turtles need a health check, and it's Robert's job to protect from their fierce bites; Terri and Bindi welcome seven new lemurs from the United States; the Rescue Unit must save possums caught in a chimney.

Bindi and the keepers ready Sophie the Baby Giraffe for her first steps into her enclosure; Robert helps to hand-raise Melman the Kangaroo; Terri oversees a health check for Ravi the Red Panda.

Hunter the Sumatran tiger is blind and must be sedated for his annual eye check; the keepers prepare young giraffe Scarlett for a road trip to South Australia, reuniting her with family.

Robert wrangles Utah, a venomous 12-foot king cobra; Dr. Amber visits Tandora to care for wild koalas; back at the zoo, an old injury flares up for Bruce the brolga, a bird that has been in the Irwins' care for 26 years.

Rosie the giraffe is ready to give birth; Robert has a bloody encounter with a wild python that has entered an enclosure; Terri helps the keepers wrangle Chief the Tasmanian devil.

Terri welcomes Mballa, a new cheetah cub from South Africa, to the Australia Zoo family; Robert sets out to save a stranded platypus and Bindi prepares to meet Bert the Koala Joey as he emerges from his mother's pouch for the first time.

Wes and Robert remove eggs from the nest of saltwater crocodiles Terra and Bosco in a nerve-wracking but necessary venture; Bindi tends to the training of otters Percival and Daisy; Terri makes a zoo volunteer's dream come true.

Terri helps determine if Caballe the rhino is pregnant, while Robert hopes to get the zoo's Aldabra giant tortoises to mate

Robert travels to Australia's Great Barrier Reef to help conduct research on manta ray; the Zoo's Rescue Unit, Wildlife Hospital and Volunteers team up to save a baby wallaby struggling to survive.

Terri attends the exam of Charlie the tiger to determine if his tumors were successfully treated; Bindi and the Small Mammal Team help develop a vaccine for Eden the Tasmanian devil; Robert discovers the true genders of the zoo's shingleback lizards.