Are they the next companions?

Dunno but the ending felt like a set-up for something.

Obvious guess is a reappearance in this series and I've said elsewhere that she could be this year's Tesalecta - but they also had "kid's TV spin-off" written all over them - somewhere between X-men and Manga.

I think they'll definitely come back sometime

People were saying the same after the scene with The Doctor and Robin Hood at the end of Robot of Sherwood a few weeks ago, and the same about the woman in Into the Dalek the week before that.

This TARDIS is going to be getting quite crowded

Watching Doctor Who Extra, I get the feeling we'll seeing them again...

At the end, the actors were asked where they see their characters a year on, and they said they imagine meeting up with the Doctor and Clara from time to time. Then the narrator says excitedly "Well you never know, we may be seeing this dynamic duo again some day!" and then the credits roll I'd be more surprised if they didn't show up again to be honest.

I hope not.

It's Psi that worries me. I understand a lot of people like him because of the computer mind, and it isn't something that has been done on Who, but it's what makes me a little wary of him. It seems like a 90's throwback to cyber-punk. Johnny Mnemonic/Ghost in the Shell/ Neuromancer/Ergo Proxy. I know a few of those are classics in their own right, but I personally find the whole concept of computerised brain and deleted memories have grown a little stale - and trite.

Saying that - the deleted memories, and past could have saved him as a character. But now he has them again, not sure there is a story - or character growth with him. If they developed that throughout the series, and had him recover his childhood or something and be conflicted about it - or shocked by his past brutality or deeds or something - he could have been a very powerful character. I dunno.

He might be good as a companion - but at the same time I think they've already destroyed the thing that could have set him apart.

I think there are two ways that Moffat and company can go with Psi and Saibra ....

1) They get another episode like Craig did in Series 6
2) They get a semi-recurring status (1 or 2 eps during Series 9 and 10) like the Paternoster Gang and UNIT (Kate/Osgood)

Either scenerio would suit me because like Journey Blue (IMO), they're the type of guest characters you at least want to see another appearance from, plus they have interesting backstories as well to boot.

option 3 - never seen again
option 4 - she's already been seen loads of times only we aren't aware of it - yet.

I'd like to see them at least one more time.

While I don't think it will ever be referenced the upgrade that Psi had could it be early version of what Adam had done?

They could always bring back Psi and Saibra - along with Strax & Co for a grand finale (Like they did with Captain Jack, Sarah Jane, Rose & Martha!)

They have potential!!

im seeing this series as a building up of 2 sides....the doctor has blue, robin, psi, saibra...people he has helped...and on the other side there is missy gathering her team of people the doctor has not saved or not kept his word to...i reckon all these people are going to pop up somewhere around the finale.

Moffats got a habit of doing that anyway, whether its the pirates and danny boy in the battle of demons run, or churchill and other supporting characters in the wedding of river song so im convinced we will see all these people again

I LOVE this idea! What a finale that would be - all in the place of Paradise or Heaven!
Certain people like Danny or Churchill wouldn't know which to choose!

Now factor in what you saw this week - he didn't save his two new friends in the same way that he didn't save Gretchen and yet they are alive.

Just because you didn't SEE him do something doesn't mean it didn't happen.

And we saw this week that memories may not be what they seem and deleted memories can be restored - including electronic memories.

I liked both of those characters, far more than I like the lizard gang, and would like to see them again.

Oh me too. I never understood how the lizard and her 2 mates were always billed as 'fan favourites'

Psi & Saibra seem much more interesting.

Would make a change from young pretty earth girls running around after the Doctor

Because a lot of people respond well to them.

Some people don't.

I cannot stand Mrs Brown's Boys. But I concede that it is one of the most popular recent comedies. It's not my cup of tea, but it is for plenty of others.

Didn't Saibra get rid of her mutant ability at the end? In fact, they're on shaky ground with her, as she was basically Rogue with Mystique's powers.

Ooh! Unlike that. And it's quite Moffatt.

Also it might explain why he has a writing credit on the episode so he can use the characters again without asking the other writer's permission!

I rather liked them, I actually think Series 8 has been very strong in it's one-shot supporting cast members so far.

Stuff submitted to the BBC belongs to the BBC, doesn't it? I thought that's why they can't take unsolicited material anymore...

why not if they own it? It makes more sense if they don't accept outside material because they wouldn't own new characters. Or am I missing something...its early here!

I think it's to do with costly contract negotiations. If they were to take an unsolicited script, then they would need/try to buy the rights to the characters, plot and future plots... If they task their own 'in-house' team to write stuff, then it's implicit in the contract already signed by the writer that the BBC own the copywright of all they have written.

Yeah, because Steve Thompson, the co-writer, and Moffat's sherlock collaborator, would really be likely to object to them using his characters again and the royalties he would receive if they didn't take this precaution...

And so, Moffat adopts a new model of villainy: a Machiavellian genius out to screw other writers over by appropriating their characters.

That Moff is a dastardly cad!