Mac, otherwise known as a “Mysterious Alien Creature”
You can see that Mac was intended to be a loveable critter in the ET mould, but sadly, he comes off as a noxious little turd, given to capering round with Ronald McDonald and pouring skittles down his throat. Not many aliens can successfully double up as fast-food advertisers, but then, not many aliens are as happy to pocket the corporate shilling as Mac. The grasping little shit.
If Pegg & Frost Had To Look After Him:
Living on a staple diet of coke and sweets, Mac would probably fit right in…