Never as prominently as during the Jon Pertwee years, but yes, UNIT did show up from time to time. It's also been featured in a number of unofficial-but-practically-canon productions by Bill Baggs Video, produced mainly during the 90s when fans were suffering from Who withdrawal. <img src="/images/icons/tongue.gif" /><br /><br />Post-Pertwee episodes (BBC only) featuring UNIT that I can think of off the top of my head:<br /><br />TOM BAKER<br />Robot - heavy UNIT involvement<br />Terror of the Zygons - heavy UNIT involvement<br />The Android Invasion - heavy UNIT involvement<br />Seeds of Doom - UNIT used to establish government ability to call on the Doctor<br />Hand of Fear - UNIT used to establish why the government trusts the Doctor<br /><br />PETER DAVISON<br />Time Flight - UNIT used to establish government ability to call on the Doctor<br />Mawdryn Undead - Brigadier is a major character, but he's retired; UNIT is discussed heavily<br />The Five Doctors - minor UNIT involvement; Brigadier is a major character<br />Resurrection of the Daleks - UNIT mentioned to establish Doctor's credentials<br /><br />COLIN BAKER<br />None that I can think of, alas. <br /><br />SYLVESTER MCCOY<br />Remembrance of the Daleks - UNIT doesn't exist yet, but we meet its 1963 predecessors<br />Battlefield - heavy UNIT involvement<br /><br />CHRIS ECCLESTON<br />Aliens of London - aired just last weekend and ended with a cliffhanger; UNIT troops were involved with the defense of a captured "alien" pilot; may have much more involvement in the next episode <div class="Discussion_UserSignature"> <p> </p><p><font color="#666699"><em>"People assume that time is a strict progression of cause to effect, but actually from a non-linear, non-subjective viewpoint it's more like a big ball of wibbly wobbly . . . timey wimey . . . stuff."</em> -- The Tenth Doctor, "Blink"</font></p> </div>