This story takes place after the Flash episode 'Flash back', and after Supergirl episode 'Manhunter'. This is my take on the cross-over. This story goes AU as far as Supergirl is concerned after 'Manhunter'. This is my first Supergirl/Flash X-over, and I hope it stays true to the characters. Please review.

After moving in to the college dorm with tech nerd Cisco he finds he has a very unexpected type of neighbour with more than one surprise. Follow as the young couple have to deal with demons from each other and much worse... College. This is a Karry fanfic ( Kara x Barry )

Story starts after Barry and Kara defeat Livewire and Silver banshee. Barry returns home only to realise he may need Kara's help to save his friends, only to realise when she gets there that he has feelings for her. Will that affect his mission, or simply aid it? Barry also has to come to terms with the fact that he's not the only speedster anymore.

"It can never be just 'nothing' in this city, Kiera. Plenty of strange things happen around here on a regular basis." In National City, all sorts of strange things happen, but when a dimension-travelling speedster reawakens a villain's vendetta, the city is thrown into a state confusion. Supergirl must decide if this new hero is a threat or an ally. Barry must find a way home. (AU)

The Flash, Supergirl & Green Arrow face their greatest challenge yet, but they may not have to face it alone.

After Patty breaks up with Barry he decided to visit an old friend in National City: Kara Danvers aka Supergirl. Will Kara and Barry find something new in each other, something beyond friendship. (Barry/Kara)

When Barry Allen makes a surprise visit back to National City, his efforts to be helpful land Alex in a rather embarrassing situation inside Maxwell Lord's office. [cross-posted from AO3]

Sunshine Sanctorum is a mental institution for Star Man. In this world and the next, it houses many a hero and villain. That list includes but is not limited to: Oliver Queen, Barry Allen, Cisco Ramon and Winslow Scott Jr. (Flash/Arrow/Supergirl Crossover)

As Barry and Kara prepare for their wedding, Kara sees some of the guest that Barry has invited! Barry/Kara, oneshot drabble.

Arrow has employed John Barrowman for four seasons, but there hasn't been a musical episode, so I don't have much hope for The Flash or Supergirl. The next best thing? Karaoke with the happier superheroes on TV. K-plus for a tiny bit of language.

Barry/Kara. This is an alternate take on the Flash episode "Rupture"—reimagining it as another Supergirl crossover. This story includes spoilers for The Flash and Supergirl with a few liberties taken to certain plotlines in these shows.

After an article from Iris West reached Cat Grant all the way in National City. She sends her assistant and her friends to Central City. to see what is the big deal about this Flash. It gave Kara a chance to meet up with an old friend. And see some surprises underneath the masks.

After leaving Kara behind, Barry thinks he made it home. He's wrong. In a world similar and yet completely different, Barry must team up with another version of a good friend and fight a foe who just won't die. Will he make it home this time? And can he stop Zoom now both are stuck on SuperEarth? - Three chapter follow-up to Supergirl's "Worlds Finest".

This time Barry needs Kara's help to defeat Silver Banshee and stop her from stealing a weapon that could destroy both worlds.

When two superheroes team up to take down an alien...

Barry and Kara create a whole new meaning to long-distance relationships. Travelling to and from alternate universes to visit gets Barry in trouble with his team. But, once it's sorted out, Team Flash meets Supergirl and Cisco collapses from fanboying internally.

5 times people freaked out about Kara and Barry's relationship, and the one time they didn't.

1.18. Barry and Kara share donuts on a rooftop.

Sometimes wisdom comes with age and other times it comes with experience.

The Fastest Man Alive of one Earth and the Girl of Steel from another are the multiverse's first ever interdimensional couple, see how that plays out especially with their friends meet. Barry/Kara.

After trying to cross over to Earth 2 Barry finds himself stuck in a world he hadn't planned on. Now Supergirl finds herself with an unexpected ally...and maybe something more.

Qué pasaría si Flash lograra emendar las consecuencias de su viaje pero a un alto precio, que para salvar a todos tuviera que abandonarlos. Llegando a un nuevo sitio que proteger donde no es el único benefactor con habilidades. Un mal sumario puede implicar una buena historia…pero eso decide lo tu

Barry's trip to this Earth takes place earlier as he faces a Red K-enraged Kara. All comments welcomed.

The DEO encounters The Flash, who warns them of incoming disaster. Will their combined forces take it, and what is he hiding from them?

Barry has an encounter with a hero from an alternate world.