Waterloo Road airs a big episode for teenager Kevin Skelton and his new foster parent Daniel 'Chalky' Chalk this evening (January 31), as a surprising revelation threatens to tear the pair apart.
When Kevin is busy preparing for a robot competition, he is stunned to discover some personal files on Chalky's computer which suggest that the Maths teacher has changed his identity and isn't who he says he is.
Digging deeper into the mystery, Kevin begins to fear the worst over what Chalky has to hide. As Chalky ends up with a cloud of doubt hanging over him, will the whole truth come out?
Digital Spy recently caught up with Tommy Lawrence Knight, who plays Kevin, to hear more about the drama in store in tonight's episode.
How would you say the fostering situation is working out for Kevin and Chalky so far?
"They get along well and Kevin is definitely very fond of Chalky, but at the same time, he's been through many foster homes in the past. I think that means he's quite reserved and not fully confident that he can be comfortable with Chalky.
"Kevin is so excited about being in a new house, but he doesn't want to get too excited and then find that it all goes wrong. He's a little bit paranoid about committing himself fully to the situation."
Is Chalky everything that Kevin expected?
"Yeah, I think he is. Chalky is such a fun-loving character, who also has similar interests to Kevin - they both love their Maths.
"But one problem is that Chalky really wants to push Kevin when it comes to learning, so he's buying him little gadgets and chess games. It makes Kevin feel a little bit like a lab rat sometimes!"
In this week's episode, Kevin and Chalky are expecting a visit from the social worker. Are they confident it will go well?
"Well, Chalky obviously wants the social worker to see that the situation is working out lovely and everything is spick and span. But Kevin is being a standard teenager with a messy room - he's leaving food about and clothes are everywhere!
"Chalky tries to be stern with Kevin and tells him to clean his room, but Kevin just says he's busy and he'll do it later. I think it's something that Chalky will have to get used to - that teenage laziness!"
An inter-school robot competition also causes some tension between the two of them. Why is that?
"Kevin is very interested in this competition - he's really eager to get going and get started. He wants to put a robot forward, but Chalky doesn't want him to do it. Chalky thinks they should get the fostering situation all sorted first.
"Kevin goes behind Chalky's back to create a robot, and it causes a little bit of tension when Chalky finds out. Chalky feels like Kevin has betrayed his trust a little bit, while Kevin feels that Chalky isn't letting him do what he wants to do. They're not quite seeing eye-to-eye on this situation."
While preparing for the competition, Kevin makes a shocking discovery… What happens?
"Kevin is using Chalky's computer behind his back as part of this robot competition, as there's various technical mumbo-jumbo involved! But Kevin finds hidden files on the computer, and it reveals a huge secret that Chalky has kept from everybody. It makes Kevin feel completely betrayed, because Chalky's not the person he says he is."
How does the discovery affect their relationship?
"They have a blow-up about it, and Kevin doesn't know what to think. As Kevin looks into it more, he even thinks that Chalky could be hiding an abusive past, so he accuses him of being a paedophile and things like that.
"We've got some brilliant scenes walking through the school together shouting at the top of our lungs, which was great fun to film. I can't wait to see how it looks."
Can Kevin and Chalky get back on better terms again?
"You'll have to wait and see in the episode! Hopefully things can sort themselves out in the end, but if Chalky does reveal what's really going on, I think Kevin will still feel betrayed at the fact that he kept this deep, dark secret. Hopefully they can make up and see eye-to-eye at the end of it. If anything, it could strengthen their relationship. They've had quite similar backgrounds and that could make Kevin feel a bit more comfortable."
The episode also sees Austin Healey make a guest appearance. Why does he visit the school?
"Austin presents the award at the robot competition. He was a lovely guy and it was really nice to meet him. I got to have a couple of scenes with him, which was good."
How do you feel about filming a fostering storyline?
"I'm really glad to be exploring a real-life issue. I know quite a few foster kids myself and when I was offered the part of Kevin, I had some conversations about it with them. It was nice to broaden my own mind about it, as I didn't know too much about foster care - I didn't know the ins and outs of it.
"From getting this job and chatting to some of my mates who've gone through foster care, I've found the whole thing really interesting. I've enjoyed playing it and I'm sure there are plenty of people out there who'll be able to relate to the storyline and enjoy it. Hopefully it will make them feel a bit more confident about themselves."
What kind of a reaction have you had for the role of Kevin in general?
"I've really had nothing but good comments about it, which is really nice. Getting noticed out on the street is a little bit daunting at times, but everyone is so polite and nice.
"People come up and say, 'Can I have a picture with you please?' and I say, 'Of course, it's no hassle'. I've had nice feedback from it all, and I hope I can keep that up."
Last time we spoke, you vowed not to watch any of your own scenes! Have you changed your mind since?
"I have! Waterloo Road has been the one job where I've actually sat and watched myself back on the telly! I'd been to screenings on jobs before, but it was literally the first time I'd watched myself on a telly.
"I think it's something that I've got to overcome if I want to grow as an actor. But watching the scenes back, I'm picking up on a lot of things that I do. I'm now getting self-conscious about the way I walk, as my arm swings all about the place, it flops everywhere! I walk like a bit of a mug, so I'm trying to walk a bit cooler!
"When I watch myself, I spend most of my time criticising what I'm seeing. I'm trying to stop doing that and watch the scenes that I'm in from an outsider's perspective, but I'm not very good at that!"
We know that George Sampson has been back on set recently. Have you had any scenes with him?
"I haven't had any scenes with him, but I've seen him about the place quite a bit. He's a cracking fella and he likes his Xbox, which is great for me because I've finally got a pal here who I can talk about Xbox with!"
Can you give us any hints on what you're filming at the moment?
"At the moment there's quite a beautiful storyline going on between Kevin and Dynasty. They become quite close - really good friends. I'm enjoying that, and it's going well!"
> Read our spoiler for tonight's 'Waterloo Road' episode
> Read the latest 'Waterloo Road' spoilers and news
Waterloo Road airs on Thursdays at 8pm on BBC One. Get the Inside Soap magazine on your iPhone or iPad