What's scarier than ghosts, goblins and the walking dead this Halloween? The mind of Sam Thompson: father, husband, Northface-sponsored ultra-runner and race organizer of the Carkeek 12 Hour.

As Sam states on the race site "The 2010 race will be very scary." No kidding.

The loop in Carkeek Park, located in North Seattle, is 1.93 miles. Competitors will run or walk the course over and over with the goal of racking in as many as many miles as they can during the 12 hour race. And unlike many time-based events, this course isn't flat. Not even close.

Each loop on the stone and dirt trail includes two bridge crossings and 430ft of elevation gain/loss.

This monster of the race kicks off this Saturday, October 30, 2010 at 6am in Carkeek Park. Have a tip for a time-based event? Add a comment below.

I'll be toeing the start line Saturday and this is my first time-based endurance event, so Wish me luck!