Captain Cook: Obsession and Discovery, 7.30pm, ABC How did a Yorkshire farm boy become the greatest explorer in history? Why did 18th- century Britons think discovery of a fabled southern continent would make their nation the most powerful on earth? This is beautifully made, wholly engaging television about us, our country, and one of the most important figures in our history. Tonight, discover how the Great Barrier Reef almost ended things before they had begun, and learn how a sail was used as a lifesaving bandage for the damaged Endeavour. My Name is Earl, 8pm, Seven A dazzling tour de force for that jailbird Earl Hickey and his unexpectedly helpful cohort. Earl’s creativity is a blank page, but Randy has more imagination than Doctor Evil, Dirty Harry, Thunderbirds and Gomer Pyle combined. Darnell sings soul and Joy goes animated. Even Catalina is a latent Latina drama queen.