Another Superman, the Crashing Airliner

In fact, aside from Kara, neither Peter nor Clark had been among the people Barry had planned to recruit. Because during his conversation with the Mysterious Person called the Monitor, the list of heroes he had been given to find and recruit contained only Kara in the universe they had just visited. Although Barry did not understand the Monitor's true intentions, he still intended to follow the list of heroes provided by the Monitor and seek out heroes from various universes.