SHOULD ZYGONS BE BYGONES?

Some, nay, many Doctor Who monsters returned time and time again. Some didn`t, but clearly had what it takes (or should that be "took"?) Some... well, some were just plain crap (saw a bunch of kids taunting the Magma Creature the other day...) If you were lucky enough to wake up and find the rights to your favourite show lying next to your bowl of Honey Nut Loops, would you have the Doc tangle with the Tractators? Would he wrestle the Wirrn? Would he karate-kick a Krynoid; get rogered by a Rutan; or make juvenile gestures at the Gell Guards? Which old foes would you spring from the home for retired monsters and why?