When rogue scientists are unethically considering mixing different homegrown vaccines with low rates of protection into a hybrid one, or are planning to inoculate people with two or three doses of different vaccines, to boost efficacy.
A doctor that discovers the ability to time travel and goes back into time to vaccinatethe children of Anti-Vaxxers with out their knowledge or permission.
Honey, how are we going to protect little Bobby Joe and Sue Ellen from The Vaccinator? How do we even know if he hasn’t gotten his hands on them yet?