I've read a few 'unofficial guides' before, but I have to say, none of them compared to this extremely impressive effort. For a start, this baby is looooong; just over 500 pages with pretty small text, and there's no filler whatsoever, just tons of information.
The research Crichton has done for this tome is absolutely staggering; in an effort to cover every stage of the making of Thundercats, he's interviewed every contributor to the series he could find. Want to know about the planning and development of Thundercats? He's spoken to the producers and designers. Want to know how it was written? Interviews with the writers. EVERY facet of the production is covered in detail, as everyone down to the sculptors of the toys get to express their remembrances. A few of the creators are sadly now deceased, in which case Crichton speaks to friends and family to fill in the gaps.
This is no hagiography ot gushing fanbook, either; this is a warts-and-all look at the 'Cats. Reading about some of the minor 'feuds' among the creatives, and hearing the views of those left bitter by their experiences, all help to capture the high-pressure environment that goes into producing such a hit show.
There is also a complete episode guide, with Crichton's reviews of each story backed up by neat comments from the writers; wherever another interesting fact can be squeezed in, it is. However big a Thundercat fan you are, I guarantee you will learn something new from this book.
I can't recommend this exhaustive effort enough to anyone that remembers being glued to their screens in the eighties. This is a serious, incredibly researched treatment of a classic creation.