The Cartoon Network/LEGO "Big Build" Sweepstakes was a contest on CartoonNetwork.com from October 23-31, 1999 or Cartoon Network's The Scooby-Doo Project with a Scooby-Doo, Where Are You! marathon that began Saturday, October 23, 1999 at Noon and look for the toll-free number given during commercial breaks.
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Lego-Cartoon Network Scooby Doo "Big Build" Sweepstakes Commercial (1999)