Question: In what year did the team whose mascot is named Mr. Met when their first world series?
Answer(s):
answer: 1969 World Series

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ?c)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
?c ns:sports.sports_team.team_mascot ns:m.01xn5q . 
?c ns:sports.sports_team.championships ?x .
?x ns:sports.sports_championship_event.championship ns:m.0fjp3 .
?x ns:time.event.start_date ?sk0 .
}
ORDER BY xsd:datetime(?sk0)
LIMIT 1