Robert and Terri take to the skies to release three rescued sea turtles near the Great Barrier Reef. Bindi anxiously awaits the birth of the zoo's first tiger cub in years. Richie helps a baby wallaby in his struggle for survival.

As Bindi celebrates her 21st birthday, she gets a surprise proposal from her boyfriend, Chandler. Meanwhile, things get dangerous as Robert wrangles gators in thick mud. Terri helps with the momentous birth of a baby white rhino.