To plug my alienware 18 into a surge protector that is plugged into a extension cord?

Why wouldn't it be? Are your power cords secretly snakes or something?

is it just me, or is this like, the fifth thread you've made regarding outlets

 

if i didn't know any better, i'd think you had an outlet fetish 

Don't worry man, you'll be just fine.

Probably, but I'd advise against it, and only do it if nothing else is plugged into that power strip. The extension cord is likely not rated to supply however many ports are on the power strip, and chaining together things that each increase the number of power outlets increases the risk of plugging too many things in, which is definitely a fire hazard. From what I can tell, the Alienware 18 adapter is 330 watts, which is more than most devices; many cheap extension cords aren't great to use long-term with that kind of load, and plugging more into the power strip (which is likely to be tempting) takes it to "definitely a bad idea."

Some of this depends on how far it'll have to stretch and what kind of extension cord it is. It also might be better to plug the computer into the extension cord, and plug that into the power strip.

As a general rule of thumb, you should never plug a port-multiplying device into another port-multiplying device; it's too easy to accidentally overload something when doing that. Port-multiplying devices should really go straight into the wall, especially if you plan on using this long-term.

To plug my alienware 18 into a surge protector that is plugged into a extension cord?

 

That depends on a number of thing.  First and for most.  What is the entire load of Surge protector?  what the entire load of breaker that the wall out let is one.