it was sort of meant to finish of the whole Dr. Who saga as I recall - the US pilot had failed and it was now consigned to the shit-can of history (FUCK YOU GRADE).
Nice touches in it include:
leaving the sound on while spying (the time monster)
Young Julia Sawallah (press gang) as the companion.
We will explain later....
Sonic vibrator.
Still Broadbent! Grant is kind of the lost doctor, I was always hoping he would pick up again at some stage...
Although has anyone seen this with Lenny Henry flashing forward to the distant future of EARTH 2010....
or bizarrely
when the doctors also visits the year 2010....... featuring the Rani!
As for the fundamental flaw in the show - we know. we don't care, it's not a pure science lesson in time-travel theory like quantum leap or back to the future or star trek 4. When the doctor explains things as "Wibbly-Wobbly Timey-Wimey things" i think it became clear exactly what their position is. Never let "reality" get in the way of a good story.
Jo Grant bugged me as she seemed to set back the women's movement by decades "don't ask me doctor, I'm only a girl"

but, if people want some titstand for exposition - she's the benchmark.
Time to bang on about Colin Baker again.
I remember the regeneration scene and the shock as Baker woke up a douche after Davison's incredibly nice doctor, people HATED it (I used to do an impression of it at school "Change... and not a moment too soooooooon" followed by some nostril flaring).
I always thought I hated his doctor - but then watching all of them back I was struck by how much more interesting he had become - yes, he was self-absorbed, rude and saddled with scripts that were designed to have the series cancelled asap. but it was a fresh take illustrating how personalities change with regeneration, simultaneously showing how time-lords get a bit more mad with each regeneration - something that tied in with the trial of a timelord. An insulting doctor who refuses to admit he's wrong (EVER) and is endlessly annoyed by the stupidity of others. It gave a weird abused-wife vibe to his relationship with Peri. It's a bold take but a bit different and he should be remembered for that rather than the stinkers he was given to act.
Overdue for revisiting I say!