Watch Captain Underpants: The First Epic Movie (2017) HD Full Movie Free on SolarMovie. Watch Captain Underpants: The First Epic Movie (2017) online free. Two overly imaginative pranksters named George and Harold hypnotize their principal into thinking he...Two overly imaginative pranksters named George and Harold hypnotize their principal into thinking he's a ridiculously enthusiastic, incredibly dimwitted superhero named Captain Underpants.