Okay, here's what I found. I don't know if it will really help, though.
I found an episode guide for Shells, and this is what it says.
Angel and Spike return from England defeated, knowing that the ancient demon Illyria has completely taken over Fred's body and soul. Upon learning that Knox and Gunn have each contributed to her demise, Wesley is bent on revenge and Angel tries everything to restore Fred, including calling on an old friend from Sunnydale. Meanwhile, Illyria tries to locate an ancient temple where she believes she will find an army ready to help her destroy mankind.
I also found a transcript of this episode, but I just couldn't read it all. It was white on black and it was giving me a migraine so I had to stop. (My personal opinion is I don't know why people think this is cute.) Anyway, I got as far as them looking for Willow. Here is the link to the transcript.
Transcript for Shells I hope this helps.
Nancy
