If your spouse is a Nonresident Alien, you may elect to file Married Filing Jointly or file Married Filing Separately, but in either case, your spouse will need a Social Security number or an ITIN if you are going to file electronically.
If you have a dependent, you may be able to file Head Of Household, which would free you from the obligation of obtaining an ITIN or SS number for your spouse.
If you are unable to get a Social Security number or ITIN for your spouse, you will need to enter a fake number in the Taxpayer Identification Number (TIN) box and then print out and mail the return. You will need to whiteout the fake number you entered, replacing that with the letters NRA in the TIN box.
There is an excellent page of information from the IRS here. There is more information about Taxpayer Identification Numbers (like SS and ITIN numbers) here.
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