Rocket-Bye-Baby was released in the 1971 Hot Wheels series. The casting is known for the name reference to "Rock-a-bye-baby" and it looked like a futuristic car. The original '71 release featured black plastic air brake/intake ducts on the sides which opened when the rear exhaust pipes were pulled out. This casting was also released in 1973 as a Shell Promo, minus the Spectra-flame paint schemes and 'active' side ducts.