Can you achieve a satisfactory score on this one?

1. On what TV series were 12,000 people killed when a nuke went off in Los Angeles, only for the whole disaster to be completely forgotten about a few hours later?

Buffy the Vampire Slayer

1. On what TV series were 12,000 people killed when a nuke went off in Los Angeles, only for the whole disaster to be completely forgotten about a few hours later?