For Australians in the 1930s, Phar Lap was a national hero. Born in New Zealand in 1926, Phar Lap won 37 of the 51 races in which he started earning him the title of 'The Greatest Racehorse ever'.

In 1930, just two days before the Melbourne Cup, an attempt was made on Phar Lap's life but Tommy Woodcock shielded Phar Lap who went on to win the race.

Phar Lap died in California in 1932. Autopsy reports stated that Phar Lap died of a 'colicky condition' due to eating wet grass.

However, allegations of foul play were made against owner Tommy Woodcock and incompetence against vet Tony Nielson. Animal X explores the mystery and controversy which surrounds the death of 'The Greatest Racehorse ever'.