The agents Otis, Olympia and Oona try to escape from a time loop. They need to make a gadget that adds up to 50, so they must find the remaining 10 in headquarters or they will be stuck for infinity! A villain sets off a backwards bubble and Ms. O, Otis and Olympia only have 20 yes/no questions they can ask Backwards Bob to find the antidote. Using a number line and greater than/less than tools, can these three agents find the solution before they run out of questions?

Originally released by PBS, 2016. Streaming video file encoded with permission for digital streaming by Infobase on March 15, 2022.