The Talons of Weng-Chiang (Fourth Doctor).
An excellent story by Doctor Who veteran Robert Holmes. All of the story elements fit. A man from the future takes on the image of a god in order to get the locals to assist him in finding his lost time cabinet. Many six part Doctor Who serials tend to slow down by parts five and six because the writer is stretching the story. Not so in this case. Holmes avoids it by giving the ancillary characters, Litefoot, Jago and Chang, much more to do. They actively participate in moving the story forward even when the Doctor and Leela aren't around.
The Key to Time: The Ribos Operation (Fourth Doctor).
Another excellent story by Robert Holmes though comparatively quiet in relation to The Talons of Weng-Chiang.
Tamm's Romana gets off to an interesting start but Holmes decided to used the old trope of smart in book knowledge, lacking in practical knowledge when writing her. Baker's Doctor seems wackier then ever in this serial giving the audience multiple double takes and random mumbling, however it doesn't detract from the story and adds to it in several places. The dialog between the two con-artists worked well, Cuthbertson gave his character Garron a great sense of comic timing. The serial started somewhat abruptly with the introduction of the White Guardian. I'm hoping more information about him and his counterpart will be given later.