From sofiyan- Themystries
Ross Marquand played Red Skull in Avengers: Infinity War and Endgame, taking over the role from Hugo Weaving. ... Because when he jumps into the time machine at the end of Endgame, he's gone for a second and then comes back as an old man.
The great thing about the MCU is that there are a seemingly endless number of stories to explore. Whether we’re going back in time to learn more about our favourite heroes or encountering characters read more at this point, it seems like every single Marvel player could come back into the fold at some point.
we first saw the real Red skull in the First Movie of Captain America:-the First Avenger.
at that time we had knew that Red skull operated HYDRA but captain Didn't know that S.H.E.L.D was an also a part of HYDRA
in Captain America 2 and 3 we understood that it was operated to collect the infinity stones which were on earth