Conversation so far:
Who is DC Comics' Comet Post-Crisis?
It was revealed that DC Comics' Comet was Andrea Martinez, a gay stand-up comic and Comet's male form was originally a jockey rebuilt as a superhuman with equine DNA.
What happened to DC Comics' Comet Post-Crisis?
Andrew Jones attempted to save Andrea Martinez from an avalanche, but they both died. This caused them to combine into one being, thus Comet became the Earth Angel of Love.

Question: What Comic did he first appear in?
Self-contained rewrite: What comic did DC Comic's Comet first appear in?