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| SO-2 serum | |
| Type: | Chemical compound |
| Continuity: | Marvel Universe |
| Aliases: | SO-2 Serum Super-Soldier Serum |
| Availability: | Unique item |
| Manufacturer: | Ted Sallis |
| 1st appearance: | Savage Tales #1 |
Ted Sallis developed the SO-2 Serum that turned him into a Man-Thing. The SO-2 Serum gave its user immunity to all known toxic biochemicals. However, it was declared unusable when it was discovered that it had a side-effect: turning its users into monsters.