8 different Mutant Mega Bone characters. These were created to go with the Mutants Crazy Bones line of characters, and were sold in packs of 2 - in plastic bubbles so that one could tell which Mega Bones they were buying. These were first released during the Halloween season at Target stores.
These bones also came in a variety of colour and shape types - malformed bones were rare, but glow-in-the dark variants were popular. The image below shows three different variants of Eyesore; one standard, one glow in the dark, and one slightly malformed 'gooey' bone.