A short lived spin off of Walker was attempted in the spring of 1999. Sons of Thunder centred around Walker regulars Trent Maloy (James Wlcek) and Carlos Sandoval (Marco Sanchez), both were introduced in a Walker movie of the same name. It replaced Walker in its time-slot for a six episode run, but never saw the light of day after that. It should be noted that after the failed series both Trent and Carlos were pulled from the show, never to be heard from again.
Guest stars John Amos and Tess Harper both appeared in Bruce Willis movies. Amos appeared in "Die Hard 2" (1990) and Harper appeared in "The Jackal" (1997). Harper is one of numerous 'Walker, Texas Ranger' guest stars who later appeared on the AMC drama Breaking Bad (2008).
Clarence Gilyard Jr. and John Amos both appear in Die Hard 1 and 2 respectively as antagonists