Guinan

Which are all the PIC episodes with legacy characters in them? (Other than picard.)

With some characters like Guinan and Dr. Cochrane having experienced or met some people from the future before the future comes to pass, at least according to their articles here, I've thinking about Albert Einstein's theory of how time is all relative. Do any of you at all suppose that in at least the Star Trek universe, that theory could be proven correct due to those individuals' encounters with those incidents? It's a long shot by far, but I'd like to hear what you all have to say about this.

A Q appears.

To me this suggests that 1. the Q and El-Aurian's had a treaty or worked together at some point. 2. Q being angry with Guinan means that she took advantage of that treaty.

Does that make sense, or am I far out on a limb here?

I saw this on Facebook. The number plate of the car shows Series 2 Episode 1, which is the first episode Guinan first appeared in in both the TNG and PIC.

In the PIC episode, we saw a much younger guinan in LA. Are el-aurians capable of reversing their physical age? If so why didn't Guinan do this when she became 12 year old in "Rascals" is it a rare among el-aurian trait or typical of their species? Also do they have memory problems when they do this de-aging thing? Or was Guinean an alcoholic like raffia?

Could it be possible that Q in season 2 of star trek Picard turned the prime universe into the mirror universe when he went back in time.

Is there any possibility that Whoopi Goldberg will return to star trek?