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Well, it should cause a regression in the genetic matrix that results in the destabilization and assimilation of abberant DNA, leaving the host free of mutagenic potential. If I knew for sure, I wouldn't need you to test it.— Dr. Henry

Test mutagenic serum on a super-mutant. Try Broken Hills is a quest in Fallout 2.

Quick walkthrough

Side Quest: Test mutagenic serum on a super mutant. Try Broken Hills
Have Science skill 80% or more.
Talk to Dr. Henry.
Go to Broken Hills. (optional)
Use the serum on a super mutant.
Return to Henry.
Reward: 1000 XP, Robodog as a follower

Detailed walkthrough

With a Science skill of 80% or more, talk to Dr. Henry. Asking about cyber-genetics gives a mission to inject a super mutant with a prototype serum. Use it on a super mutant and record one's observations.

The serum will work on both Elmo and Marcus in Broken Hills, and any super mutants such as Grundel at the Mariposa Military Base. It will also work on Gond and Lenny in NCR town. Return to Dr. Henry and receive the option of adding a cyberdog non-player character (Robodog) to their party, subject to the normal party limit rules.

Bugs

  • Be aware that using serum in a duel with Lenny is buggy; it appears that once combat damage is done to Lenny, the serum will work and the fight will end, but if used at the beginning of battle, the game gets frozen permanently in combat mode. [verified]
  • If you use the serum on a super mutant in combat mode, you get the 1000 XP and complete the quest but the mutant will take one or a few turns before dying. If you kill it before then and loot the corpse the mutagenic serum may still be there. [verified]
  • If you talk to cyberdog after reporting back, you can ask Dr. Henry about cyber-genetics again and get the whole quest all over again. [verified]