I'd like to see an episode or two that focuses less on space than on time.
Maybe he could loose someone (e.g. Donna) to a villain early on then go back in time in a future episode to undo her death or something?
Or maybe he could find that his defeat of a villain early on in the series depends on him going back to that time in the future and then when it comes to the future, he doesn't go back so those things are undone and he needs to go and back and do them.
Just something interesting, but not too alien orientated.
Or maybe two different episodes could take place at the same time and he could run into himself lol like they did in father's day, only this time they could both see each other.
Maybe he could loose someone (e.g. Donna) to a villain early on then go back in time in a future episode to undo her death or something?
Or maybe he could find that his defeat of a villain early on in the series depends on him going back to that time in the future and then when it comes to the future, he doesn't go back so those things are undone and he needs to go and back and do them.
Just something interesting, but not too alien orientated.
Or maybe two different episodes could take place at the same time and he could run into himself lol like they did in father's day, only this time they could both see each other.