Synopsis

Some­thing mys­te­ri­ous is hap­pen­ing with mys­te­ri­ous peo­ple mys­te­ri­ous­ly at a near­by aban­doned air­field, which is the cov­er for an impend­ing alien inva­sion. Already the aliens have tak­en pos­ses­sion of sev­er­al Very Impor­tant Peo­ple at the Defense Min­istry to smooth oth­er every­thing and are hunt­ing for the Lost MacGuf­fin in order to begin the inva­sion. For­tu­nate­ly some­one was old friends with the Brigadier and knew just how to bypass secu­ri­ty to con­tact him direct­ly. The Brig, of course, sends the Doc­tor, after he gets back from a lit­tle side trip that has noth­ing to do with the main sto­ry, and soon every­thing turns into (pseu­do) Zom­bie Apoc­a­lypse! with vil­lagers get­ting implant­ed with alien embryos to con­trol them to hold off the UNIT troops until the actu­al inva­sion begins. All is saved when a WW II Spit­fire air­plane dives into the tele­por­ta­tion beam and halts the inva­sion permanently.