Nickelodeon Gak is back! The Nickelodeon Gak - Green is the incredible squishable, squeezable, squashable, stretchable, bounceable, ploppable, poppable stuff! Once you pick it up, you won't want to put it down. Gak's awesome "Splat" container lets you make all sorts of wacky sounds when you squish the Gak around. Smoosh it, Twist it, Bubble It, Mix it...you've got the knack for Gak!