What are the key elements and storylines in a 'Torchwood' and 'Doctor Who' crossover fanfiction?

Often, such crossovers might have Merlin using his magic to assist the Doctor in facing interdimensional threats. Or, the Doctor could travel to Camelot and encounter Merlin's challenges. There could also be time paradoxes and alternate timelines explored.

Character consistency is a key element. The characters from Torchwood should act in a way that is true to their original personalities. For example, Captain Jack Harkness should be flirty and fearless as he is in the show.

It could bring together beloved characters from both shows in unexpected ways. Maybe there's a shared adventure that combines their unique skills and storylines.

Often in such crossovers, you'll see unique mash-ups of technology and gadgets from both shows. Storylines might involve saving a planet that's at the crossroads of Star Trek and Doctor Who's timelines. Also, there could be fun character interactions as they face challenges that require the combined skills and knowledge of both crews.

A storyline could involve a character from Torchwood getting trapped in a time loop. The 11th Doctor shows up and, with his knowledge of time mechanics, tries to break the loop. Along the way, he gets to know the Torchwood team better and they learn a great deal from him about the nature of time and the wider universe.

The main elements in such a fanfic would likely be a compelling plot that makes sense within both franchises. There could be crossovers of supporting characters, cool action scenes that showcase their abilities, and a resolution that leaves fans satisfied. Also, the writing style should capture the essence of both Doctor Who's sci-fi mystery and Flash's speedster adventures.

Well, it could have the Doctor teaming up with the Autobots to save the universe from a time-traveling Decepticon threat.

The key elements could include mash-ups of the Doctor Who's technology and the Avengers' weapons. The plotlines might have interdimensional portals, time paradoxes, and the Doctor helping the Avengers save multiple universes.

Key elements could be crossovers of their iconic tools or weapons, like the Doctor's sonic screwdriver and the Winchesters' angel blades. Plotlines could see them dealing with a threat that spans multiple timelines and realities. Or it could be a story where a character from one show accidentally alters the timeline of the other, leading to all sorts of complications.

The key elements usually include seamless integration of the different universes, maintaining the core characteristics of both franchises, and creating an engaging plot that makes sense for both sets of characters.