Batman: The Animated Series was not aired in the same order the episodes were produced. All episodes are listed by production number.
The last 20 episodes were known as The Adventures of Batman & Robin, where Robin was used more prominently. Production wise this is considered season 2 (episodes 66-85). The last episodes were aired in 1995.
Episodes were also re-aired as a package show with Superman: The Animated Series under the title The New Batman/Superman Adventures.
The series spawned two full-length features: Batman: Mask of the Phantasm and Batman & Mr. Freeze: Sub-Zero.
These episodes were followed by The New Batman Adventures in 1997.