Water Kingdom: Beethoven
The 999 is pursued by the Black Knight, a caped figure in a dark, fog drenched world. The Black Knight requests Tetsuro stay on the planet and be his friend, but Tetsuro refuses and he attacks. They then travel to the planet Yonde 3 where the son of an innkeeper, a musician, desires Tetsuro's pass so he can leave the planet.
Aired 21/12/1978EP 15 - Water Kingdom: Beethoven

Galaxy Express 999
After witnessing the death of his mother and being left for dead at the hands of Count Mecha, ten-year old Tetsuro Hoshino is awakened by a mysterious woman, Maetal. In exchange for only his company, Maetal offers him the ride of his life on the Galaxy Express 999. It is said that those who travel aboard the legendary train to the end of the line can receive a free mechanical body and with it, immortality.
Impoverished and alone, Tetsuro leaps at the opportunity and joins Maetal on a quest that will span the cosmos. As the Galaxy Express 999 makes its way across our solar system and beyond, Tetsuro is drawn deeper into a dangerous universe where peril lurks at every stop.
(Source: Discotek)