Mattel Strange Change Machine Late 1960s

This was a bit like Creepy Crawlers but you didn't actually create the creatures. The creatures were in cube form and when the cube was heated and would turn into whatever creature it already was. Then you can heat it up again and crush it back into a cube. If you look at the photo #2, which is the back of the box, you can see the process.
In photo #1 it shows the little cube turning into a huge T Rex. I put a cube and the Rex and as can be seen the T Rex is about the same size as the cube.
Photo #3 is the Strange Change Machine it self. The crusher is built in.
Last is the vacuform base with some of the creatures. It came with 16 creatures although I think there may have been more.