Barry allen aka the flash running in the speed lab track when he gets a vision of his future which makes him lose his footing and him hitting into a wall knocking him out.
Central city (streets)
Lisa snart aka golden glider is riding her motorcycle to her house when she gets a vision of her future making her lose control of her motorcycle hitting into a lamppost knocking her out.
Speedforce
Barry wakes up seeing lisa snart and the speedforce in the form of Leonerd snart "we am i and lisa snart here" barry asks "you will know when miss snart wakes up as it has to do with you both and the vision you both saw" the speedforce says as lisa wakes up holding her head in pain which goes away instantly "hmm good you are up" barry says helping her stand "thanks flash where are we" lisa asks as barry is vibrating his face "the speedforce" barry says "good now reedy to see your future and act on it" the speedforce asks the two nod and the speedforce waves a hand making a wedding ring appear on their fingers and a suit appear on lisa with pure gold lightning.
The suit on lisa:
Oops! This image does not follow our content guidelines. To continue publishing, please remove it or upload a different image.
"So i marry the flash in the future" lisa says "it seems so" barry says then stops vibrating his face "how about the name velocity sound" barry asks as they take each other's hand "i like it but i love you more" lisa says then the two kiss "once you both wake up find each other at the top of jitters where vibe will contact barry saying that nazis from earth x are invading earth 1 looking for supergirl who will be on earth 1 because of mr. queen's wedding" the speedforce says then hands them both a flash ring then sends them back to the real world.
Jitters rooftop (central city)
Barry and lisa speed to the roof of jitters lisa jumps into her now husband's arms barry chuckled lisa is wearing her civilian clothes with her leather jacket the two former enemies kiss "i have to go to the wedding so stay near the church and speed in when the nazis attack" barry says "ok dearest i love you" lisa says "i live you too" barry says then speeds off and lisa speeds to the building across from the church once there she slips her flash ring on and speeds into her suit.
Meanwhile in the church during the wedding
Barry is standing next to oliver as he made barry his best man Oliver and felicity are about to kiss when nazis bust down the doors and start shooting barry and wally speed around catching bullets when a female speedster speeds in knocking a nazi out while kara is fighting her evil twin and in a matter of minutes the battle is over.
Star labs (central city)
The heroes are looking at a captured nazi who turns out to be tommy merlyn then velocity walks in and leans against a wall "this is a long shot but maybe they are here for supergirl" velocity says vibrating her voice "that could be a possibly" kara says then velocity takes off her mask and stops vibrating her voice she smiles until her and barry both pass out making Oliver catch barry and sara catch lisa.
Speedforce
"What is it this time" barry asks "i have someone for you to meet" the speedforce says stepping aside to show a woman in her 20's she has barry face while she has Lisa's eyes hair nose mouth and chin "meet your daughter nora snart allen" the speedforce says and nora hugs barry and lisa tight then the three fade from the speedforce relam.
The real world central city (star labs)
Barry wakes up to see his wife and daughter still out he also sees Cisco looking at a blood test of Barry's daughter waiting for the results to come back when it does he gasps calls Caitlin in when she walks in and sees the results "oh my god" Caitlin says then barry sits up.
