Taking up the challenge...

to find bad sci-fi actors turned bad author, I give you Walter Koenig. The other part of m.a.d.'s challenge, to actually read them, I leave for heartier souls. From his list of accomplishments:

Walter has written for the television series "Family, Powers of Mathew Starr", "Class of '65", "Land of the Lost"* and the "Star Trek" animated show.

This actor-writer has seen publication with the non-fiction "Chekov's Enterprise" and the satiric fantasy novel "Buck Alice and the Actor-Robot". He also created the three issues of the comic book story "Raver" published by Malibu Comics.

*Not to dredge up the whole X-Files topic again, but this is another show I'd rather watch. I never saw Mulder take on anything as bone-chilling as a sleestack.