1 – Story Mode – HQ
Stark Toy number one can be found in the HQ Building after Episode 6. Next to the machine at the right of the screen is a grey door, walk through this door and then enter the second door you see above you. The first Stark toy piece is in this room
2 – Story Mode – Episode 7
Towards the end of the level you have to defend three vents/power nodes from being destroyed by Doombots. To the right and left of the area are raised sections with snipers on. The one of the left holds the second Stark toy. To reach it, fill the hole in front of the platform with webbing, then use the web to jump onto the platform to reach the second Stark Toy.
3 – Free Play – Episode 2
After you face the dummies and learn about blocking/Heroic powers you come to an area with stone statues. Across the bridge you will see one of the statues glowing. Destroy it using a strength character (Hulk/She Hulk) and you will get the third Stark Toy.
4 – Free Play – Episode 4
In the first room you are in during this episode, there is a stone circle to the bottom left of the room. Destroy it using a strength character (Hulk/She Hulk) and you will get the fourth and final Stark Toy.