Thunderball Simulator Disc in Marvel: Ultimate Alliance (Wii)? Doesn't Exist

There is no "Thunderball Simulator Disc" in Marvel: Ultimate Alliance on Wii.

You're likely thinking of Thunderbolt—an electrical ability used by characters like Iron Man, Thor, or Storm. Some mods or custom maps may add similarly named items, but nothing official.

Describe the effect or context you remember, and I can identify the actual ability or item.