The Which Whats are 5 intelligent but somewhat messed up alien beings - Wheely WHEN, Whizzy WHY, Hoppy HOW, Walky WHERE and Wocket WHAT.

When their planet QUESTO is destroyed, the Which Whats make their way to Earth where they meet the 'zany' Dr Whatchamacallit.

On the Doctor's private island, 'The Isle of Q', the Which Whats get up to all sorts of mischief while finding out all about life on Earth - along with the use of such devices as The Histogram, The Holo-suite and the Future Framer, The Which Whats learn all about things past, present and future in visually exciting ways.