The set comes with figures of Avengers Iron Man and the Hulk, villain Ultron and new character Scarlet Witch.

The Hulk bursts from the box!

Hulk goes back to his roots: the set comes with a comic.

The set contains 248 pieces.

Hulk can't wait to get stuck in!

Hulk Buster Smash is part of a line-up of super-powered Lego. It's out now for $30 or £30 (that's around AU$60, although it's not yet on sale in Australia).

Scarlet Witch comes together in the instruction booklet.

The Ultron Prime minifig has a few unusual pieces.

Hulk checks out the instructions.

The set includes...whatever this thing is.

Figures can be made to "fly" with this "invisible" stand.

Iron Man's helmet, and the helmet for his helmet.

Who's this chap?

Yes, it's billionaire Tony Stark -- also known as Iron Man.

Most Lego figures come with two faces for extra play potential. Here's Tony's fighty face...

...and here's Tony's smarmy face.

Snap on the faceplate to transform Tony Stark into Iron Man.

Here's the back of the ferrous superhero.

Pieces simulating blue "light" bring Iron Man's repulsors to life for flying or shooting bad guys.

Flicking a special piece allows you to send Iron Man flying for real.

Ultron Prime can "fly" thanks to "light" bricks, just like Iron Man.

"There are no strings on me!" says Ultron Prime, voiced in the movie by James Spader.

"Something cocky but witty!" says Iron Man, played in the film by Robert Downey Jr.

The bricks and pieces that will form the Hulkbuster suit.

Come on Hulk, it's for ages 7-14.

The torso of the Hulkbuster suit. Each section is built individually.

Here we can see the Hulkbuster start to come together as we add the arms.

The set includes some unusual pieces.

You put your right leg in... The Hulkbuster is nearly ready to bust some Hulk.

This is the Hulkbuster's hand.

This is the head of the Hulkbuster exosuit.

Hulkbuster completed! The set opens to allow Iron Man to jump inside and take control.

Iron Man takes his place in the Hulkbuster exosuit. The special heavy-duty suit features in "Age of Ultron" in an epic scrap between Hulk and Hulkbuster.

Hulkbuster armour made its first appearance in the comics in "Iron Man #304" in 1994.

Iron Man in an Iron Man... It's Iron Mans all the way down!

The set then closes up and clips in place...

...ready for bustin'.

The hands flex and the right arm packs actual firing bricks.

Hulkbustin' makes me feel good.

Right, where's that pesky Hulk?

Hulk chills out with a comic.

Look out Hulk!

He's behind you...

Hulk and Hulkbuster square up.

Come an' have a go if you think you're Hulk enough!

Iron Man throws the first punch...

Hulk gets stuck in.

Give us a hug.

It's the main event, grapple fans!

Don't lose your head, Tony.

Luckily, Tony and Hulk remember they're buds, and all is well. Everyone back to Avengers Tower for shawarma and cocktails!

HULK SMASH!