Both “Catspaw” and “I, Mudd” feature a variety of professional actors hamming it up, but only in “Catspaw” does the ham actually smell a bit off, probably because of the giant cat. No, seriously: a giant cat. Meanwhile, in “I, Mudd”, the cast of The Original Series engages in improv theater, which results in one of the most fun episodes of the show. Plus! Richard is really interested in learning about Trek slash.