Astro Boy: Ivan's Planet - Robot and Human Friendship (2003)

Atom is attending a party on the space station with Dr. Ochanomizu. However, while at the party, he hears a voice. It is the voice of a robot that had been abandoned by someone. The abandoned robot is a security guard robot named Ivan, and after being refueled with energy, Ivan sets off on a journey to find his owner, Minya.