When earth is attacked by the hung hounds, ravenous trans-dimensional mutts with HUGE penises, it's left to cool-headed Humphrey (who has no idea what's going on), the super-sexy and feisty Dawn (who does), a retired porno actor, and a monkey in a wedding dress to save the planet! Only thing is . . . Glinda, the mermaid queen who has the key to unlock the mystery isn't letting go of it, unless . . .