Comedian Tommy Davidson could have made a career of imitating Sammy Davis Jr. Good thing for us he didnt. You know Davidson as the skinny little guy on In Living Color, but hes added lots to his résumé since his Living Color days. Along with the entire Wayans crew, Davidsons worked with Halle Berry, Spike Lee and Robert Townsend, and hes about to be seen in Black Dynamite with Michael Jai White and Youngins, a Will Smith-produced animated series. 8 p.m. Thursday, 8 and 10:30 p.m. Friday and Saturday, 7:30 p.m. Sunday. Houston Improv, 7620 Katy Freeway. For information, call 713-333-8800 or visit www.improvhouston.com. $22.