Thunder Strike of 20 Years Later (20年後の雷撃) is the 43rd episode of the Katekyō Hitman Reborn! anime series.
Lambo's fight versus Leviathan of Varia begins. As a 5 year old and a 15 year old, he stands no chance to the "Levi Volta" attack of Levi. However, when the 15 year old Lambo jumps in 10 Year Bazooka 5 year old Lambo left behind, Lambo from 20 years later appears. The 25 year old defeats Leviathan with relative ease using his "Elettrico Reverse" and "Elettrico Cornata" techniques, but the 5-minute limit of the 10 Year Bazooka ended, and Lambo reverted to his 5 year old form. Just as Leviathan was about to severely injure Lambo, Tsuna stops the match in Hyper Dying Will Mode, surprising everyone.