When Eddie teaches Haggis to be more assertive, things soon gets out of hand as the furry giant starts to throw his weight. Meanwhile Fiend is reduced to a gibbering wreck, now that Haggis has taken his role as the bossy monster.
The Carlson's move into their new dream home but little do they realise there are monsters living in the basement. How long can Eddie hide Fiend, Haggis and Norman from the rest of the family?
Eddie is panicking about the arrival of his school report, and tries to stop the post with the help of the monsters. But they are too busy being educated by Kate and Nick, who are desperate to prove who is the brainier parent.