All incarnations and feats allowed,
He is in his most recent incarnation, but with all his prior feats allowed etc..
He gets 2 day prep bewtween matches and has full knowledge of then. No going back in time and killing them. For the purpose of the fight, his sonic screwdriver can get past anything as it can in the TV show. As it cannot be disputed it cant and its only opinion after that. Doctor is fighting to the death, he will only fight to Kill, his morals are on, but limited. so he will do whatever it takes short of mass civilian killing.
Round 1 - Thing and human torch
Round 2 - Movie avengers
Round 3 - New 52 JLA Fight takes place in all battles throughout space no limits so he can basically pick them off.
Round 4 - 5 day prep. for doctor.
round 6 - 5 day prep for doctor.
round 7 - Living tribunal, doctor gets a month prep.
I know these people are hard, but with this amout of prep, doctor could be considered very very strong.