He may be a big-shot moneyman now, but Ted Templeton flashes back to his Boss Baby past, when he and his brother, Tim, renew their rivalry and make a shocking discovery! Turns out, Tim's infant daughter, Tina, inherited Uncle Ted's job as an undercover BabyCorp agent. She is on a secret mission to stop an evil plan to turn babies into brats and she needs both brothers to help! Ted and Tim now have to turn back into children for an outrageous adventure, that reminds them of the true power of family!