City Without Night
As the 999 approaches the City Without Night, Maetel tells Tetsuro of a lake there, but tells him not to go out to see it. When they arrive on the planet, Tetsuro gets in trouble for going out at night, but is saved by Maetel. They are told that no one is allowed out at night because of a dangerous dinosaur, Heron, that lives in the lake. Tetsuro and Maetel head there anyway and help Heron when it is captured by some photographers. Heron actually is a friendly creature, and later helped Tetsuro and Maetel out when the police try to arrest them for the death of the photographers.
Aired 24/01/1980EP 62 - City Without Night

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)