The chase is on the left.

A chase toy is any toy in a line that has deliberately been made more rare than the rest of the toys in that line. The term is a literal one - collectors tend to "chase" them down. Some see it as the thrill of the hunt, others see it as a tedious chore, especially if the chase figure is only a variant. Either way, you're bound to pay a lot for one, as they tend to be produced in extremely small numbers.