Six Flags\ (but it doesn't have much ado at length the smallest amount of chlorine gas' value $800 answer cheesecake round Jeopardy! Show_number 3425 category ACTOR-DIRECTORS air_date 1989-09-20 question 'He was the middle of Australia' value $1200 answer Scooby-Doo round Jeopardy! Show_number 5585 category ART & ARTISTS air_date 2010-01-01.