I can't believe it's same director who did other great episodes like Trick or Treats and Moody Margaret Moves In, and written by Dave Ingham who wrote Fireman Sam movie: The Great Fire of Pontypandy, and some CGI episodes.
This episode made our favourite protagonist Henry was the horridly bad one, accusing his dad, his annoying brother Peter and archenemy Moody Margaret for stealing Mr Kill (this episode acts the opposite to the one of Henry being accused of taking Margaret's mobile phone). I just wish Henry didn't go as far as using force and sever the strings on Peter's violin as means of coercing Peter to confess to something he really didn't do.
Regardless of what Henry's ma said that no-one stole Mr Kill - still seems like stealing if she hadn't told Henry that she took him to wash him - taking other people's things without informing them is definitely stealing. And Henry's ma isn't likeable anyway - some reason she forces Henry to go to some girly sleepover, etc.
And there's the big error plot hole as to why Henry didn't see his teddy hanging out on the washing line when he was at his fort.
Undoubtedly, the worst Horrid Henry episode I've seen so far.