Some sample questions from this category:
* With whom did Walter Bishop work before he went into the mental institution?
* There is one character in each episode who is often hard to find but is always present in at least one scene. Who is it?
* Which FBI agent nearly dies from a parasite that has wrapped itself around his or her heart?
* Against even Walter's advise, Olivia willingly goes back into the tank. Why does she risk her life?
* When Peter was a boy, his kidneys failed and no one knew how to cure his disease. What ailment was he suffering from?