With her boyfriend Warren up to no good and posing a potential threat to Riley and Seth on the trip, Mitzeee hopes to make sure that things don't spiral too far out of control. However, she also creates some problems of her own for Riley by posting up compromising pictures online which show the footballer with a stripper - knowing that Mercedes will see the snaps.
As the week continues, tension between Mitzeee and Riley takes an unexpected turn as it seems that the pair could actually have feelings for each other. Mitzeee also finds herself at the centre of a big stunt as a white-water rafting jaunt goes horribly wrong…
With an action-packed week ahead for her character, Digital Spy recently caught up with actress Rachel Shenton to hear more.
This is the second year running that you've been involved in Hollyoaks Later. What's it like to film the late-night specials?
"I really love being part of the late-night episodes - they're quite different as they're all shot on location, so you see the characters in situations that you wouldn't normally see them in. Also, because they're on after the watershed, you get a bit more creativity and you can push the boundaries with what the characters can talk about. I really enjoy being involved in Hollyoaks Later - it's great."
"Well, Mitzeee is banned from being part of the hen celebrations because she falls out with Mercedes. But she just thinks, 'Well, my bag's packed, so I've got to go somewhere!' Also, Warren's going on the stag do and she's not going to let him have a good time without her! It's a decision she makes on the spur of the moment - it's not too premeditated."
We'll see Mitzeee try to protect Seth quite a bit in Hollyoaks Later, won't we?
"Yes, definitely. Warren has some information that he's hoping to get out of Seth, but obviously Mitzeee knows Warren very, very well and she knows how he deals with things. She's worried that he may be a bit too heavy-handed with Seth, so she does her best to suppress that and rein him in a bit!"
"Well, Mitzeee has always wanted to be a WAG and she's always been jealous of the lifestyle that Mercedes is going to have. Mitzeee thinks that's a little bit unfair, so there's that element to it. Also, by this point, it's become apparent that Riley doesn't want Warren as his manager anymore, so Mitzeee thinks that if she causes a bit of trouble for him and Mercedes, the wedding might not go ahead and things might stay as they are. But I think she's probably being a bit ambitious there!"
How far would Mitzeee go to wreck the wedding?
"Surprisingly, she probably won't go as far as some other people. Mitzeee does have a conscience and she cares about Riley. Yes, she likes to get what she wants, but often she's not setting out to hurt anybody. I don't think she'd go as far as people might expect."
What else happens at the stag celebrations?
"Well, there's another stag celebration going on at the same time and you'll see some rivalry between the two groups. That gets a bit heated, and because we're on after 9pm, that's one area where we can really push the boundaries. There's quite a good fight!"
"Yes, there's quite a lot of outdoor activities on the stag do, including white-water rafting. Mitzeee ends up in a bit of a heated debate with Warren, then she ends up on the raft without a life jacket - and she goes overboard. That's quite scary!"
We've also heard that there's some sexual tension between Riley and Mitzeee in the episodes…
"Yeah, there's definitely something there between Riley and Mitzeee, and that's explored in the late-nights. It's quite interesting, as usually you've just seen that they hate each other and there's not really any affection there. But in Hollyoaks Later, it comes out that maybe they've just been acting like they hate each other because there is something there. They've grown up together and they realise that they've got a lot in common."
Mitzeee has been quite separate from the Costellos on the main show lately, so was it nice to get back in with them for Hollyoaks Later?
"Really nice! I'm filming with them today actually. It's really exciting, because I started with them and had my first scenes with them, so it's always nice to go back and do more scenes with the family. We've just been talking about that on set."
Have you enjoyed portraying Mitzeee's relationship with Warren?
"Yeah, it's been very, very interesting with Warren - there's been some great twists and turns, and we explore that even further in the late-night episodes. You'll see that Mitzeee feels every emotion for Warren - she loves him, she gets angry with him, she desperately wants to be with him, but she wants to change him at the same time. There's such an eclectic range of emotions that she feels for him, and you'll see some quite explosive arguments in Hollyoaks Later!"
> Read some extra bonus snippets from Hollyoaks star Rachel Shenton in Soap Scoop
Hollyoaks Later airs all this week at 10pm on E4. Get the Inside Soap magazine on your iPhone or iPad