In 1940, a replacement, Pilot Officer T. B. "Septic" Baird (John Gregson), is landing his Hawker Hurricane at "Pimpernel" Squadron's airfield. Just as he touches down, however, a straggler from an earlier mission taxis across his path. Septic's quick reactions allow him to "leapfrog" the other Hurricane, averting a costly disaster. His action, however, causes him to crash his replacement aircraft into the bungalow of Squadron Leader Barry Clinton (Cyril Raymond) at the end of the runway.