And yes, Jim from Neighbours makes a regular appearance as Charles Whidmore, and Kevin Durand does his own incarncation of the Terminator in the season finale. Will this dude go down, and then when he does, Locke needs to keep the not so eco warrior alive to prevent another catastrophe, such as the boat being blown up, being that is the place where finally the remaining passengers of Oceanic  Flight 815 were rescued. Also, this is when we finally get to see the writers'producers vision of what Lost is really about, as a Scifi show, when we could be dealing with timetravel, as seen when the doctor turns up dead on the beach with his throat slit., Daniel ids him as Ray, the doctor from the boat Kahana, the boat the was supposed to be their rescue ship. What is going on in that boat? Daniel makes his call to the boat, and the reply was that their doctor was fine.

We head back to the boat where Sayid and Desmond witness more disturbing scenes from their 'rescuers', and when Heamy decides to do away with the doctor after Heamy has a disagreement with the captain, who is obviously getting more and more confused as to why he and his boat was here in the first place. This ends in the doctor, Ray, having his throat slit.

Also, the other scifi element is when Ben has to move the island, in a more of a Stargate fashion, he leaves the Orchard via the small alcove where time travelling bunnies were experimented on. We see a more humerous side to BEn and Locke as our very own Laurel and Hardy before hand as Locke tries to watch one of the training videos from the Dharma Initiative, warning not to fill the pod with anything metallic, more like the warning you get with a microwave manual, but as Locke watches the vid, he is distracted and aghast as he witnesses Ben just doing that, filling it with metallic objects, such as the furniture, and other metallic bits and bobs.

Ben then leaves through that same pod, after putting on his big winter coat, and once he does his explosion thing, and he enters into another area where the temperatures are well below that of the island. There is a heavy large wheel for him to turn, which he struggles, him being a petite chap, but in the end he perserveres. The rescue helicopter carrying the oceanic six, plus the pilot and Desmond were on the way back from the boat after watching it explode, and they see the island disappear.  

and this is the part where somehow Ben finds himself in an Arabian desert as first seen in episode The Shape of Things to Come, when we see him in the desert and no way of knowing how he got there, till we watch season finale.

Are we dealing with wormholes? time travel? who knows, and are the Dharma Iniative and Mr Whidmore rivals or part of the same team?