Thousands of people have complained about a trailer at the end of Doctor Who on Saturday.
The cartoon version of Graham Norton appeared at the bottom of the screen to advertise the next show, right when things were getting really exciting.
Did you watch it and what did you think when the cartoon appeared?
Did it ruin the episode or didn't it bother you?
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"Things were just getting interesting and then out of the blue comes a little cartoon man popping up on the screen! I was very angry!"
Lauren, 9, Newcastle, England
"A bit, because it got me distracted from what the Doctor was saying."
Rebecca, 13, Manchester, England
"I didn't notice!"
Frankie, 11, Inverness, Scotland
"Yes it spoilt it and it happens all the time near the end of programmes. The CBBC logo keeps moving and this also spoils programmes. Please stop it."
David, 9, London, England
"I think everyone is overreacting, it didn't cover his whole mouth as shown in the picture, it only covered a corner!"
Triona, 10, Belfast, N. Ireland
"It didn't ruin it at all!! I didn't even notice, I was too busy watching the show!!"
Ada, 11, London, England
"I live in Scotland so we didn't get the ad, but I would have been annoyed if we had!!"
Isobel, 13, Scotland
"I watched this episode in Spain so the ad didn't come up on my screen, but what's the point in advertising a show when it's on the minute after?!"
Natalie, 11, Lancashire, England
"I think that it is pointless putting notices up there. If people wanted to know what was on next, they would check the TV planner. It made me get distracted when it was a really good part."
Chris, 13, Isle of Wight, UK
"It was really annoying. It spoiled the moment."
Tristan, 12, Suffolk, England
"I think it did ruin the end of the episode. I got totally distracted and missed the important bit. Please don't interrupt programmes until the end credits roll."
Joanne, 9, Swindon, England
"Just at the good bit it soooooo put me off! Grrrrrrrrrrrr, it ruined the tension at the end!"
Anya, 12, Dorset, England
"I think that it totally ruined the show as I was enjoying myself, then it came on and made me angry! I think that it should not be there until the credits come on."
Rachael, 11, Inverness, Scotland
"I don't think it matters if it covers his mouth because you can still hear what they are saying and it only lasted about three seconds."
Charlie, 9, Cwmbran, Wales
"It didn't ruin anything! The fans are overreacting! So what if we couldn't see his mouth, we could hear him!"
Zarghona, 10, West Midlands, England
"I think they should have a voiceover in the credits like they usually do instead of a cartoon. It ruined it quite a bit."
Thomas, 13, Birmingham, England
"It was just a little bit of the episode. Doctor Who does that to other shows!"
Thierry, 10, Milton Keynes, England
"This was completely unfair. I love Doctor Who and that completely spoilt it. I mean how dare they just as it was at the good part?! I just wish they wouldn't do that, even if it wasn't at the good part, which it was."
Tabby, 10, Aberdeen, Scotland
"It didn't really bother me because I wasn't really paying attention to the bottom part of my television."
Farah, 12, Cardiff, Wales
"I didn't see the cartoon. I was too into Doctor Who!"
Hayden, 12, Dorset, England
"Yes, it did spoil the end. My cousins in Scotland didn't have it across their screen so why did we? I don't like it when any programme, not just Doctor Who, is spoilt in this way just to advertise a show."
Anthony, 14, Northamptonshire, England
"I agree with you lot, it absolutely ruined it. I was really interested but when Graham Norton came on it really put me off. If it keeps happening I'm just not going to bother watching it."
Louise, 8, Staffordshire, England
"The cartoon was very silly and ruined the ending of the episode!"
Ben, 13, Manchester, England
"Totally! It ruined my favourite moment of the episode! It was full of suspense!"
Annie, 9, London, England
"I don't see the big fuss. It was only on for a couple of seconds and it didn't ruin it a bit."
Bethany, 12, Bolton, England
"I was so absorbed I never even noticed it!! I suppose it was annoying but it's not a big deal! People moan too much."
Kery, 9, Glasgow, Scotland
"I don't really see the big deal. It's not like it covered the whole screen. You could still hear it."
Leah, 12, Cambridge, England
"When Graham Norton appeared as the cartoon, he covered Matt's mouth and I couldn't understand what he was saying and it distracted me from watching the BEST show on the telly, so yes it ruined my afternoon!"
Jake, 11, Staffordshire, England
"Well done for spoiling Doctor Who at the important part."
George, 8, North Yorkshire, England
"I am literally the biggest Dr Who fan in the universe and this upset me VERY much."
Ian, 12, London, England
"I was enjoying the story as I'm a huge Doctor Who fan and Matt Smith is a brilliant Doctor but the whole atmosphere and tension of the episode was completely ruined by that silly trail. I hope it never happens again. Doctor Who is just too good a show for this sort of thing."
Amy, 13, Sheffield, England
"I think all the fans should just chill out and get over it. It's happened and you know what the ending was, so I don't see why we have to keep talking about it. The BBC can't do anything about it now, can they?"
Cherry, 11, California, USA
"For me it did not really ruin it, it just annoyed me so don't do it again please."
Jayde, 12, North Yorkshire, England
"I love to watch Doctor Who and I am angered to the tips of my toes because of that stupid advertisement."
Andrew, 10, Perthshire, Scotland
"I found it annoying that we had to watch the cartoon. I don't even like Graham Norton! It distracted me from watching Doctor Who so I wasn't very happy!"
Jessica, 9, Manchester, England
"Seriously! Why did the BBC have to do that? I can't really say that it was annoying for me because I watched the episode on iPlayer today, but it was the first airing of the episode and I think to put the trailer COVERING MATT'S MOUTH was wrong! The BBC deserves complaints."
Laura, 10, Cardiff, Wales
"It totally ruined the best part! The BBC should not make this mistake ever again!"
Farihah, 11, Lancashire, England
"It was really silly! I had all my friends over and it annoyed us!"
Abdi, 10, London, England
"To be honest, I was enjoying the episode so much and was so gripped to the TV, that I didn't really notice it. It was a little unfair on Doctor Who fans because it ruined such a good ending for some viewers!"
Emily, 13, Cardiff, Wales
"I didn't really notice and I think people may be overreacting about this!"
Taylor, 10, Swansea, Wales
"I think that it ruined the episode."
John, 8, Kent, England
"It really annoyed me because I was really getting excited and I think it ruined the end."
Kareem, 12, Oxford, England
"I don't see what the fuss is about!"
Chantal, 11, Essex, England
"I thought the cartoon was disturbing. Me and my sister were trying to hear what Matt Smith was saying, after that came on we couldn't even understand anything. Please don't do it again."
Mathusa, 13, London, England
"I didn't really notice it."
Tasha, 13, Cheshire, England
"I hardly noticed it to be honest!"
Melissa, 10, Birmingham, England
"My dad was one of the thousands of people who complained. He was furious but it didn't really bother me."
Bella, 14, London, England
"It wasn't necessary to show a trailer at the end of Doctor Who. We know it is on next and the BBC deserved the complaints they received."
Katie, 14, Bolton, England
"It was getting really exciting and then the cartoon came on and it made me really angry."
Ioan, 10, Bridgend, Wales
"It was a bit distracting but I didn't think it was such a big thing until I saw it on the news. I guess it ruined the scene a bit but I was too absorbed to really notice."
Regina, 11, Shetland, Scotland
"I don't see what the big fuss is all about!"
Matthew, 10, Merseyside, England
"It was such a dramatic episode, and just as we hit the cliffhanger we're distracted with a cheap cartoon! Ruined it!"
Simon, 13, Derbyshire, England
"I think the cartoon totally destroyed the tension that had been built up in the episode. Both me and my brother looked at each other and said what's that all about, and then missed what was happening."
Ben, 12, Colchester, England
"Yeah it was annoying! Bit of a bad timing!!"
Emma, 12, Sussex, England
"The end was so exciting then that cartoon came on. It was really distracting."
Daniel, 12, London, England
"It was horrible. Doctor Who is the best programme and the ending was ruined by that cartoon. It was very distracting. Please don't do it again."
Mark, 13, Dundee, Scotland
"I think it did spoil it because you can't see it properly."
Rhys, 10, Warwickshire, England
"Yes, it did ruin the show. It was getting to the moment all the fans have been waiting to see!"
Jack, 11, Huntington, England
"The trailer really annoyed me."
Tom, 14, County Durham, England
"I was so angry when the cartoon advert popped up right at the end when it was getting really exciting."
Daniel, 11, West Midlands, England
"No it was fine! I don't know why people are making a big fuss. It was on for a second and it wasn't even near the exciting bit."
Hannah, 12, Kidderminster, England
"It annoyed me a lot. I do not get why they have to ruin the end with a cartoon."
Ella, 10, Leicestershire, England
"It spoiled the last few minutes and distracted me from what was going on!"
George, 10, Bradford, England
"It ruined the feel of the episode and spoiled the tension!"
Isaac, 13, Devon, England
"I thought it was a shame that it happened."
Tom, 14, Birmingham, England
"No it didn't bother me. It was just to show it was about to finish and to show what programme was coming up next."
Sophie, 11, Huddersfield, England
"The trailer really annoyed me. Wait until the program is over before going on about the next one!"
Stephanie, 14, Oxford, England
"I was so annoyed because I didn't understand the ending because of it."
Adam, 13, West Midlands, England
"I thought it ruined it because it was coming to the big part and then a cartoon popped up and it ruined the whole thing!"
Mark, 11, London, England
"I think that the BBC should think about when their trailers come on and position them in a place that won't disturb the audiences of the ongoing programme."
Joseph, 11, Sunderland, England