Reed and Victor, obviously. Namor and Victor also.

Thor and Sentry

Namor and literally anyone

Hulk and Thing

Yelena Belova and Kate Bishop

Mr. Fantastic and Dr. Strange

Dr. Strange and Dr. Doom

Professor X and Captain America

Gambit and Ant-Man

@Ham Brooks it would be stupid, not to give Reed and Doom interactions

The Hulk and The Thing

The Hulk and The Beast

Cyclops and Sam Wilson

John Walker and Sam Wilson

The Winter Soldier and Sam Wilson

Red Guardian and Sam Wilson

Reed Richards and Doctor Doom

Namor and Doctor Doom

War Machine and Doctor Doom

Thor and Sentry

Joaquin Torres and Sentry

Captain Marvel and Sentry

A variant of Tony Stark aka Iron man and Doctor Doom battling it out both portrayed by RDJ in either Doomsday or Secret Wars

variant of Tony Stark aka Iron Man and Peter Parker aka Spider-man in secret wars

Steve rogers aka Nomad vs Doctor Doom played by Chris Evans and Robert downey jr

Steve Rogers aka Nomad and a variant of Tony Stark aka Iron Man battling it out against Doctor Doom being played by Chris Evans and Robert downey jr in a duo role

Iron man variant, and the three Spider-men and Deadpool and Wolverine vs Doom and his Doombots

I Hope some of the bad hero characters introduced in phases four and five don't have huge role

If Robert downey jr isn't also playing Iron man in either Doomsday or Secret Wars I have absolutely no interest in seeing either one of these Avengers because Iron man is the only mcu character I care about along with Spider-man of course I'd rather Robert downey jr just reprise his file as Iron Man and not play and either they recasted kang and wait on Doom to be the big bad in the reboot of the mcu or just they could've just casted someone else to play Doctor Doom I thought that Tom Cavanagh from the flash tv show would've made a great Doom but no they're desperate so they went for downey in perfect world that would happen unfortunately its not a perfect world

What I heard from people I've watched on YouTube is that there filming Doomsday and they don't even have a script done yet for this

^ I think there's a finished script, but there won't be a lot of people that'll get the real script (similar to Infinity War and Endgame).

I don't know maybe there is a script I'm just gking buy what I saw and heard