You're watching 1977 commit completely to the idea that five solar-powered cars driven by teenagers can transform into a giant robot and that this is a normal solution to both racing competitions and supervillain attacks. The show treats solar energy like it's the most dangerous secret in the world, which means every episode is either a race that turns into a fight or a fight that turns into a race. It's absurd, it's sincere about that absurdity, and it never apologizes for either one.

A scientist builds five special cars that run on solar power and can combine into a single supercar. He hands them over to his son and the boy's friends, who enter them in competitive racing. Their time on the circuit is far from peaceful, though, because a villainous organization hunts them down, hoping to seize the secret behind the solar technology. The result is a 1977 TV series that mixes motor racing with a battle against a sinister group.