Spencer Holt's parents say they "live day by day," uncertain how long the terminally ill 7-year-old will live. So last week a group of sheriff's deputies came together to make sure Spencer had a day he'll never forget.

Living with an incurable form of Mitochondrial disease and struggling with seizures, the smiling Spencer is a fan of zombies and police officers. Inspired by those two loves, and hoping to help lift Spencer's spirits, Pasco County (Florida) Sheriff Chris Nocco sent an police motorcade to escort Spencer and his family to the Sheriff's Office. Luckily for everyone, they arrived just as a zombie horde overran the old jail cells.

Deputized and armed with a Nerf gun, a grinning Spencer led a SWAT team and K-9 units to beat back the undead threat (actually drama club students from two area high schools). Once the facility was secure, the boy was treated to uniformed deputies performing a dance routine to Michael Jackson's "Thriller."

"It was a perfect day for this little boy and it really meant a lot to us," Nocco told Fox13. "A lot of us are going to take a lot more memories home and have a bigger smile because of little Spencer."

"This is what I treasure, the good days," Spencer's mother Cher Holt added. "Make the most memories of every day because no one is promised tomorrow."

See more photos of the event on the Pasco Sheriff's Office Facebook page.

(via Uproxx)