Colonel Masters' Caravans

UNIT searches for the Master at Colonel Masters' caravans, his concealed headquarters where his TARDIS sits inoperable after the Doctor's sabotage. Guards patrol tight paths between caravan units, holding the Doctor captive later in locked quarters that heighten escape tension. Jo learns the site's location from the TARDIS console, linking it directly to the Master's Auton operations amid rising invasion threats. Shadows lengthen across the compound as plans unfold from within.