Having developed their own version of a TARDIS, the Daleks pursue the Doctor (along with Barbara, Ian, and Vicki) through time and space, setting up confrontations on number of strange planets (including Earth). Terry Nation's third Dalek story is hit and miss. The opening and closing adventures (on the desert planet Aridius and the world of the Mechanoids are entertaining and visually interesting (especially the Mechanoid city)) but the middle adventures, on the viewing platform of the Empire State Building (circa 1965), on a sailing ship, and in an ostensibly haunted house full of classic Universal Studios monsters, are pretty silly. The serial saw the departure of long-time companions Ian and Barbara (William Russell and Jacqueline Hill) and, although unseen, the addition of a new companion, Steve Taylor (Peter Purves), an astronaut from some undefined period in Earth's future (relative to 1965). The serial is more light-hearted than previous stories with some sight gags at the expense of the usually dead-serious Daleks and Purves' incredulous 'Gomer Pyle-esque' 'Merican who, high above the Big Apple, encounters first the human(oid) time-travelers, and then the nasal exterminators pursuing them. Despite the limp attempts at humour, I liked the first and last segments, but middle two I only tolerated to maintain story-line continuity.