The Costume: Dexter Morgan and his infant son, Harrison.What You'll Need: Cargo pants, a long-sleeved Henley tee, work boots, black gloves, fake blood splatters on your clothing and a (fake) slasher knife. Or you can buy a Dexter Morgan costume at Showtime.com. For Harrison Morgan, outfit a baby doll with a DIY onesie featuring a slogan from the 'Dexter' season 4 ad campaign, like "My dad is killer," "Cereal spiller" or "A chop off the old block," or one of the official 'Dexter' baby bibs.

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