1x17 - Superman

When he spots a woman being chased and shot at by what turn out to be German saboteurs. Clark Kent jumps on the back of their car to stop them. When the police give chase, the saboteurs end their pursuit and head back to their hideout, taking Clark hostage. The woman, a double agent who possesses the plans of the saboteurs, convinces the police to escort her to the airport so she can get them to Washington. While en route to the airport, she and her escorts are ambushed by the saboteurs. Clark, who had been laying possum as their hostage, eventually intervenes as Superman once he's learned enough of the ongoing events.