The "Brigadier" (Nicholas Courtney) walks into the lab just as the TARDIS takes an unexpected trip that sees the "Doctor" (Jon Pertwee) and "Jo" (Katy Manning) travel forward in time to the remote planet "Uxarieus" that's only recently been colonised by "Ashe" (John Ringham) and his team. No sooner have they arrived, though, than a more militaristic bunch from a mining company land and decide that the place is much too rich in minerals to be left to these folks. An arbiter is sent for, but it's "The Master" (Roger Delgado) who assumes that role and it's soon fairly clear that he has an altoget...