Renaissance man Charlie Sheen is continuing his fixation with hunting down mythological creatures - he travelled to Alaska in search of a shape-shifting otter.

Last month, the Anger Management star flew to the Scottish Highlands in a failed bid to spot the legendary Loch Ness Monster.

Now, he is extending his mission into the unknown by trying to track down a Kushtaka in the North American wilderness.

Sheen and a few of friends flew to Sitka, Alaska last week in a private jet but failed to catch a glimpse of the bizarre-sounding creature.

The 47 year-old actor tells, "(The Kushtaka is) a shape-shifting trickster who is half man, half otter. It lures one away from the campsite with the mimicked sounds of a crying baby, then kills you, takes on your form, and returns to the scene for more suckers or prey...

"It obviously knew our group was far too skilled to be snowed in this fashion so it stayed hidden like a sissy."