Horrid Henry and the Evil Mastermind

== Synopsis ==
Can Henry unmask the Evil Mastermind? Only with a little help from his friends!
== Plot ==
In school, while Miss Battle-Axe is teaching, she asks Linda what the answer is. Linda is still sleeping, replies with the correct answer, and Miss Battle-Axe asks anyone who listened. Brian answers with another one, and Andrew does as well. When the bell goes, Linda, Brian and Andrew stay in with Miss Battle-Axe, who turns back and evilly laughs opening the title card.
After break time, Miss Battle-Axe comes in, but with a song. And shows that Linda, Andrew and Brian have become her minions. Her attitude has strangely changed, and Henry goes to find out what's going on along with his classmates. Margaret thinks she was taken over by an evil mastermind, but Henry doesn't believes that, yet Ralph says that she may be right and wonders what they know about them.
Al plans an idea that to think with cleverest people they know, and then, ask them if they know anything about the mastermind, but they know they'll be onto them. 
At home, Peter is called to be known who much he knows but he is confused. Henry asks Peter where he is going which the latter replies that he has a meeting with the Best Boys.
Henry is suspicious and tells Ralph who sees it as normal. Henry asks Peter if he is an evil mastermind, but Peter does not think he is. At school, Margaret asks Henry if Peter was the mastermind, but Henry responds wasn't him. Miss Battle-Axe comes in and Margaret asks if she was clever, but when Miss Battle-Axe's turns, Margaret places a tracking device in her pocket.
Miss Battle-Axe leaves the room and Margaret sees on her phone where she is going. Miss Battle-Axe is in Miss Oddbod's office and soon Henry thinks she is the mastermind. They set a rope signal and Miss Oddbod comes in. Margaret says to Miss Oddbod they're onto her. But Henry hears noises from the office.
Henry finds out that Miss Oddbod was not the mastermind and Miss Oddbod opens the office. Miss Battle-Axe is in there calling someone called Big Big Sister. Miss Battle-Axe replies that she was talking through the computer, but Miss Oddbod says that is not possible and takes Miss Battle-Axe to the teacher's lounge.
Henry and Margaret argue about who's clever or not while the computer receives an eerie voice message before ending the episode hearing:
'Calling Big Sister... Calling Big Sister... Big Sister, are you there?...'
== Characters ==
* Horrid Henry
* Miss Battle-Axe
* Greedy Graham
* Sour Susan
* Aerobic Al
* Lazy Linda
* Gorgeous Gurinder
* Beefy Bert
* Anxious Andrew
* Rude Ralph
* Moody Margaret
* Jolly Josh
* Singing Soraya
* Brainy Brian
* Weepy William
* Fang
* Perfect Peter
* Tidy Ted
* Goody-Goody Gordon
* Spotless Sam
* Miss Oddbod
== Trivia ==
* Miss Oddbod says that it's not possible to talk through the computer but if Miss Battle-Axe was using Skype then she may not hear about it and Miss Battle-Axe was probably denying any evidence.
* This is one of the episodes where Mum and Dad are both absent.
==Videos==
Evil Mastermind - Miserable Musical - Horrid Henry DOUBLE Full Episodes - Season 4
Horrid Henry 4x49 WEB DL 1080p 1
Miss Battle-Axe does Karaoke for Sports Relief!
Category:OAS Series 4