Separately, pranksters Miles and Niles were pretty devious. But now that they've teamed up together to form a pranking duo, they are truly Terrible! It's a good thing they have come into their own as friends and pranking partners as their powers will be tested when their favourite goat and nemesis, Principal Barkin, is replaced by his stern, no-nonsense father, Former Principal Barkin, who turns the school into boot camp. Now Miles and and Niles will do just about anything to get their nemesis back, including pranking for Barkin.