No music "outro" is present.

It enhanced, IMO, the true danger/desperation of the situation Keane's and Silver's (and the world's) characters found themselves in, and gave gravitas (a little John Kerry campaign lingo, there) the E.G.'s words when he seemed to wonder if our real planet might ever get invaded.

Again, it stood in counterbalance to the tinny performances of Keane and Hammond as the aliens. Then again, that may have been intentional...and, (again, IMO) their performances seemed to get a bit more serious-sounding as the program unfolded. (I thought it was effective as Hammond's voice delivered the plea, then trailed off amidst the noise of the "Five in the family" music and background sounds.)

Scratch that...I'm guessing this hokiness-to-seriousness transformation was very much by design.