The Knight Bus was seen in the third book and film in the Harry Potter series - The Prisoner of Azkaban. After Harry escapes from Privet Drive and the wrath of his horrible aunt and uncle, he realises he has no place to go. Luckily, the Knight Bus comes around his way - the emergency transport for the stranded witch or wizard.
The die cast model of the Knight Bus is like the one seen in the film - it is a triple decker purple bus that looks like it's only held together like magic. Above the windshield is the small plaque informing us that, yes, this is the Knight Bus.
It is pretty well sculpted with some nice attention to detail, giving it an old rustic charm (all the while being purple..). Overall it's got a pretty nice feel to it, and closely resembles what it was like in the film. If you look hard enough, you'll be able to see inside it, too, which is good to see they've at least tried to put something inside.
Although one small warning if you plan on buying it - when I (and the makers) call this "die cast" they only mean the bottom bit, as the top is made of plastic. This isn't really noticeable at first glance, and it really is only noticeable at touch, but it's worth pointing out anyway so you don't feel ripped off if you were expecting it all metal.
Overall, the toy makes a decent collectors piece, if you're going for it, or as a decent toy car both for kids who like playing with their Harry Potter toys and for those who like toy cars.
Die-cast Metal Collectable. After an argument with his Uncle Vernon, Harry Potter grabs his school trunk and his owl, Hedwig, and leaves Privet Drive. He is picked up by the Knight Bus, emergency transport for the stranded witch or wizard, and taken on an exciting journey through London to the Leaky Cauldron.