My favorite fanfic that I wrote for Lois & Clark was
Soul Mates, which starts as a Lois & Clark/Desperate Housewives crossover, then has two possible endings. It was a lot of fun to craft the details of the similar but different endings.
The fanfic that I had the best time writing was a crossover between Lost in Space and Earth 2, called Lost on Planet G889. Both are space shows but one is much more realistic than the other. It was fun to mix those worlds and I got to interact with more fans from both shows while posting it.
