Super Heroes Marvel

Iron Man Mech vs. Ultron

A pocket sized Avengers face off that punches above its price tag.

Brick Rated Score

3.7/5

Set 76307 · 2025

Pieces101

Minifigs2

Year2025

Set number76307

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The verdict

I picked this one up expecting a quick fifteen minute build and a shelf filler, and that is mostly what it is, but it is a genuinely fun one.

You get a poseable Iron Man mech suit with jointed arms and legs standing opposite an Ultron minifigure that is exclusive to this set, so if you collect villain minifigures this is the only place to get him right now. At fifteen dollars it will not fill a shelf the way a bigger Marvel set does, but as a desk toy or a stocking stuffer for a kid who loves Avengers, it does its job with a smile. I would not buy it expecting depth, I would buy it expecting a satisfying little skirmish diorama.

Best for: kids and casual Marvel fans who want a quick, affordable Iron Man vs Ultron desk scene

The full review

What it is

This is one of those small Marvel sets that lives or dies on whether you go in with the right expectations. It pairs a brick built Iron Man mech, bulkier and more jointed than a standard minifigure, against an Ultron figure who squares up to him with his fists raised. Setting them nose to nose on a desk actually creates a nice little scene, and that is really the appeal here. It is not trying to be an epic battle set, it is trying to be a fun five minute pose and play moment, and on that front it succeeds.

The catch

I will be honest about the caveats. At 101 pieces this build is over almost as soon as it starts, so if you or your kid wants something to spend an afternoon on, this is not it. There is no base, no rubble, no extra terrain piece to ground the fight, just the two figures. For fifteen dollars that is a fair trade rather than a steal, and the community reflects that with a middling rating rather than a rave. It is a nice set, not a showstopper.

Who it's for

Get this one if you are after the Ultron minifigure specifically, since he is exclusive to this release and hard to find elsewhere, or if you want a cheap, cheerful gift for a young Marvel fan who just wants to reenact the fight. Skip it if you are hoping for a serious build or a display piece with real presence on a shelf full of bigger sets.

The parts story

What the build is actually like, and the pieces worth knowing about.

The build itself is quick and light on technique, the kind of set you hand to a kid who wants to feel like they built something in under fifteen minutes without needing help. The Iron Man mech goes together in stages, arms first, then legs, then the torso and head, and each piece clicks together in a way that keeps momentum going rather than testing patience.

The real value here is in the figures rather than clever part usage. The Ultron minifigure is the standout, since it is not available in any other current set, which makes this an easy add for anyone building out a Marvel minifigure lineup. The Iron Man mech, meanwhile, uses a jointed armor shell rather than standard minifigure legs and arms, giving it a bulkier, more mech like silhouette that stands apart from a regular Iron Man minifigure on the shelf.

Fun facts

01The Ultron minifigure in this set is exclusive to 76307, making it the easiest current way to add him to a Marvel minifigure collection.
02Iron Man is built as a poseable mech armor figure rather than a standard minifigure, continuing a format LEGO has used across several small scale Marvel hero versus villain sets.
03Ultron was created by Stan Lee and Jack Kirby in 1968 and became a household name after Avengers: Age of Ultron in 2015, the film this set's rivalry is rooted in.
04At around 101 pieces and a fifteen dollar price point, the set lands in the same small, gift friendly tier LEGO has used for quick hero versus villain pairings in the Marvel lineup.