Star Smashers of the Galaxy Rangers.

Just a laugh-out-loud parody of classic, epic space opera ever written. A pair of All-American young high-school geniuses invent an interstellar drive and head out (unintentionally) into the cosmos, along with a couple of unforeseen stowaways. Far out in space, they stumble into eons-long wars between alien species of unimaginable power - and malevolence, in some cases. But our plucky heroes are indomitable in the face of certain doom.

If you've read any of the stuff from the good old days, you'll find yourself laughing again and again. It re-reads well, too!