Conversation so far:
What was pre-crisis DC Comics' Comet?
DC Comics' Comet was Supergirl's pet horse and, while in his human form as Bill Starr, her brief boyfriend.
What was DC Comics' Comet like pre-crisis?
Comet was originally a Grecian centaur named Biron, turned horse by the witch Circe who originally wanted to turn him into a human. She gave him superpowers, including immortality.
How did DC Comics' Comet change into human form?
When Comet went to planet Zerox with Supergirl, a magic spell was cast that turned him human, but only while a comet passes through the solar system he is in.

Question: Are there any other interesting aspects about this article?
Self-contained rewrite: Are there any other intresting aspects about the DC Comics' Comet article?