'Arthur' character Mr. Ratburn comes out as gay, gets married

The "Arthur" premiere had social media really talking — and not just because the PBS animated series is back for its 22nd season, but because Mr. Ratburn got the happy ending he wanted.

In the episode "Mr. Ratburn and the Special Someone," the title character's third grade teacher marries another male character.

"It's a brand new world!" one of the students says during the wedding.

Fans of the show on Twitter were quick to express their surprise ...

... both that the teacher is gay and that the show — a cultural touchstone for many millennials — is still running.

GLAAD even congratulated the teacher.