When Toy Makers Had No Timidity…
“The premise of the toy was that the cubes were actually monsters, which were hibernating in the Starburst-like forms, waiting to be unleashed by the mad scientist (the child). The cubes were placed inside the see-through plastic chamber, where they were heated; and the cubes, consisting of ‘memory plastic,’ would revert to their original shapes – a variety of weird-looking monsters and dinosaurs. They could be removed from the heat (using the tongs) and, after cooling, could be played with normally, as little plastic figures.
If they misbehaved, the child could turn them back into cubes by reheating them in the chamber (remember to use the tongs!), and then placing them inside a small metal chamber in the toy’s base, where a hand-cranked vice would take the now-softened monsters and squish them back into cube form – complete with the Mattel logo on one side.”
— T. Frye, Pop-Cult.com