You are going to Watch Thunderbirds Are Go Episode 5 online free episodes with HQ / high quality. Stream cartoons Thunderbirds Are Go Episode 5 Online Fireflash. Kayo is riding aboard Fireflash, a supersonic airliner invented by Brains, but she is unaware that its controls have been tampered with. International Rescue notices the plane has vanished from their monitors and attempt to locate it. Kayo realizes that the plane is flying in the wrong direction and manages to avoid a powerful gas attack that has knocked out both passengers and crew.