Greg Adler is a prosecutor by day. At night, he's a 10-foot tall Transformer named Optimus Prime.
On Saturday night, Adler won the $10,000 grand prize at a Las Vegas Halloween costume contest. It took Adler 14 months to build his 10-foot tall costume which weighs 90 pounds and cost about $2,500 in parts.
Adler will hand out candy to trick-or-treaters Monday in his Optimus costume.