Stuff

Meta-Doctor was abandoned on post-Journey's end as 10 and rose fly off. He ends up in Leadworth and meets Mels then he finds out about the SIlence and planned to overthrow Kovarian with Melody's help. Then they capture the Doctor who's been off doing whatever.

Then MetaCrisis and Mels plan to steal his regenerations after finding out about the Timeless Child, then they'll be free to rule all of time and space.

Also if you're wondering how Mels exists, after Journey's End, the Doctor and rose have a falling out so she leaves, then everything happens like the og timeline except the Doctor never finds Melody. Also either River was a bit more hostile to the Doctor or the Doctor didn't see River as often as the og timeline.

Alt!Doctor and Alt!Melody seeing a manifestation of the original River Song. The Doctor is trying hard to ignore her and force himself into thinking he made the right choice.

"You hide a reason for shame" - The Doctor hiding the fact he knows how River dies

"You know that we are the same" - Alt!11 knows theres a part of main!11 that's tempted to change River's past as an attempt to give her a better life.

"Leaving them feeling betrayed. Breaking the bonds that you've made." - Alt!11 taunting the Doctor for failing and losing the Ponds.

"There is no price we won't pay." - Alt!11 paying the price of losing his River in order to give the Ponds a good life.