DarkSaint85
Bonified abstract
The doctor (Superman) currently does not have XYZ medicine (new powers).
However, after much travelling, he has gleaned new medicines (powers) from the pharmacy (edge of space and time).
He now sits in his hospital (Fortress of Solitude) administering new medicines (powers) to others.
The hospital (Fortress) itself gives him the necessary equipment (sun rays) needed to administer said medicines (powers).
However, there is nothing inherently special about this hospital (Fortress) or the equipment (rays). For the purposes of this thread, the doctor (Golden Superman) has travelled to Marvel, and using their equipment (the sun), he can still administer medicine (powers) to others.