One good example could be a story where they get hurt during a fight against a powerful villain. Maybe they are outnumbered and sustain injuries while protecting each other. Another example might be a story set in an alternate universe where they are in a dangerous mission and get hurt due to unforeseen circumstances, like a trap that was set for them.
Another villain could be a powerful alien race that has invaded Earth X. They are much more advanced than the humans on Earth X and are trying to take over the planet. Alex and Sara would have to find a way to fight them. This could involve Alex using her knowledge of alien technology and Sara's combat skills to find a weakness in the alien invaders.
One possible plot could be that on Earth X, Sara Lance and Alex Danvers are forced to team up against a common enemy. Maybe a powerful dictator has risen on Earth X and they are the only ones with the skills and courage to oppose. Sara's combat skills and time - traveling experiences combined with Alex's scientific knowledge and super strength could make for an interesting dynamic.
They can also show the emotional toll. Maybe Sara is worried about not being able to fight as well in the future because of her injury. Alex could be feeling guilty if she thinks her mistake led to their injuries. By exploring these emotions, the writer can create a deeper impact. For instance, when they are alone in their rooms at night, thinking about what happened and how it might change things. Also, how their friends' reactions to their injuries can add to the emotional layer. If their friends are overly worried or seem distant, it can affect how Sara and Alex feel about themselves and their situation.
A plot where Alex and Sara are stranded on a deserted planet together. They have to rely on each other's skills to survive. Sara's combat and survival skills from her time as a pirate, and Alex's scientific knowledge could make for an exciting story of cooperation and friendship. It could also explore a possible romantic relationship between them as they grow closer during their time of isolation.
You can try searching on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. These platforms have a large collection of fan - created stories, and you might be able to find some great Alex and Sara Lance fanfics there.
I'd recommend 'The Danvers Sisters' Journey'. It focuses on their growth as individuals and as sisters. It has some really heartwarming moments, like when they have late - night talks and share their deepest fears. It also shows how they deal with the villains in their own unique ways, all while strengthening their relationship.