Thanos vs. The Authority

yes she has she basically blasted the avengers clones, as a baby and when the carrier was attacked was able to enter the microuniverse😄

5000 experience part of the Doctor is as old as human life on Earth😄

Re transformations: In one of his "drama-powered" moments, Adam Warlock turned Thanos into stone. The Doctor has WAY! more power at his disposal.

Thanos in the end crumb stomp the doctor.