The ultimate hybrid: It will have jet engines to get it off the ground, rockets to kick it up to mach 4.5, scramjets to take over from there and get it up to mach 8 and out into space, and perhaps additional rockets to maneuver around in space and reenter. And I thought automobile hybrids were a little Rube Goldbergish.
SG1 had the concept what you are talking about..