When his spaceship crashes down to Earth, circa 709 A.D., alien Kainan (Jim Caviezel) is left with little resources and a quest to destroy the beast that was contained onboard. Observing a familiar pattern of destruction in the immediate area, Kainan finds himself captured by a tribe of Vikings who want to know just what caused such hostility. Endearing himself to King Rothgar (John Hurt) and his daughter Freya (Sophie Myles), Kainan hopes to lead the charge to capture the infamous Moorwen, the dragon-like monster that stalks the land hunting for human prey. Teaming up with a rival clan, led by Gunnar (Ron Perlman), Kainan and Prince Wulfric (Jack Huston) head out to slaughter the menace, only to find the primitive weapons of the era are no match for this ferocious, bioluminescent beast.

“Outlander” is one amusing motion picture, and it helps that the filmmaking remains refreshingly alert throughout. Director Howard McCain deftly mixes cues from Viking iconography and sci-fi staples to indulge in a straight-up monster movie, a swift B-picture that knows its audience and endeavors to offer fans a full plate of monster mayhem, bloodletting, and sword-happy heroics.

It’s something of a miracle that “Outlander” doesn’t resemble a Sci-Fi Original, with credit going to McCain and his crew for their efforts to make the film feel lived in, and not just shot haphazardly in a generic Canadian backyard. Filling the frame with moisture, smoke, and filthy men, “Outlander” creates the feel of a graphic novel, presenting a heightened naturalistic backdrop for these fantastical events. An adventure story at heart, McCain takes the action into forests, caves, and underwater, constantly trying to drum up a sense of excitement and otherworldly threat while embracing the gruff Viking lifestyle that typically involves serious beard growing, drinking mead from the carcasses of dead animals, and games of balance on wobbly combat shields. Unlike many sci-fi tweaked tales, “Outlander” feels complete and ready for war, with McCain creating a world to play with, not just a genre to exploit for maximum stupidity.

The Moorwen sequences are the focal point of “Outlander,” though it comes as somewhat of a disappointment to find the creature molded from strictly CG parts and labor. While an arrestingly designed beast, the cinematography and editing prefer to keep the monster at a safe visual distance (a mid-movie bear attack is also impossible to focus in on), which can be a frustrating prospect once the third act swings around. The creature is saved by the screenplay, which carefully proposes that the Moorwen might not be the bone-munching demons their reputation suggests. It’s a tweak on the formula that keeps “Outlander” fresh enough to stay invested in the gruesome happenings.

“Outlander” is a fluid genre exercise that satisfies cravings for action and Norse mythology in one fell swoop. It’s a full-bodied adventure movie that’s responsive and reverential to the needs of sci-fi escapism. Vikings? Aliens? Swords crafted from space steel? Ron Perlman as a tattooed, hammer-wielding warlord? This is an easy film to appreciate.

B+