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Series 1: 9. The Hamazing Hamsterman
Dennis gets into a fluffy mess when he runs into Von Screwtop's hadron collider with the professor's pet hamster, Galahad. To stop Dennis from completely changing into a hamster, the gang must sneak him into Wilbur's lab to use his reverse hadron collider and change him back!
Source: CBBC
Most recent episodes of Dennis & Gnasher Unleashed!
Dennis & Gnasher Unleashed!
Series 2: 17. President Dennis
Dennis is accidentally elected class president and is eager to shed the burden that comes with the title. However, every daft class policy he declares only makes him more popular.
16-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 2: 16. Thumb Wars
In a somewhat misguided attempt to resolve Dennis and Walter’s spiralling competitiveness, Miss Mistry offers thumb wrestling as a solution - but can Walter play fair, or ...
16-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 34. Extreme Sports Day
Dennis recruits Grizzly Griller to help make school sports day more extreme, but as he and JJ get competitive against each other, who is sabotaging both their chances of winning?
16-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 2: 15. Boarding Beano
Doctor Pfooflepfeffer’s first act as head of governors is to turn Bash Street School into a boarding school. However, the pupils devise a series of daring attempts to esca ...
15-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 2: 14. Cat V Dog
Walter’s pampered cat Clawdia persuades her way into the gang, and only Gnasher can tell that she has a hidden agenda to oust him from Dennis’s life forever.
15-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 33. Ralf's Last Prank
When Dennis and the gang think they have caused Ralf to lose his job, they're determined to make his last day at Bash Street School totally blam by setting up the greatest prank ...
15-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 9. The Hamazing Hamsterman
Dennis gets into a fluffy mess when he runs into Von Screwtop's hadron collider with the professor's pet hamster, Galahad. To stop Dennis from completely changing into a hamster ...
14-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 8. Night Of The Living Veg
Mrs Creecher uses the school's allotment to hold Class 3C's 'Biggest Veg' competition. Determined to outshine Walter, Dennis will do anything to grow the biggest veg. Little doe ...
14-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 7. Pie Spy
Pieface steals Professor Von Screwtop's Pastry-based Intelligent Espionage unit (PIE) after forming a strong bond with the pie-shaped robot. Pieface is dismayed when Walter stea ...
14-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 22. Red And Black To The Future
When Dennis finds Professor Screwtop's time machine in the lab, he can't resist using it without reading the instructions and starts a chain of events that lead to Gnashersaurus ...
14-09-2025
CBBC
Most popular episodes of Dennis & Gnasher Unleashed!
Dennis & Gnasher Unleashed!
Series 1: 21. The Wrong Man-ace
Dennis is mistaken for a Beanotown baddie while in disguise to sneak into 12A film. At first Dennis loves being treated like a celebrity, but as things begin to go awry his frie ...
13-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 22. Red And Black To The Future
When Dennis finds Professor Screwtop's time machine in the lab, he can't resist using it without reading the instructions and starts a chain of events that lead to Gnashersaurus ...
14-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 25. Postcards From The Veg
Pieface laments that Paul is looking peaky and needs a holiday. Dennis has a plan! But its only when Walter kidnaps Paul that he realises his chips are down and he needs the gan ...
10-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 26. The Whole Tooth
When Gnasher gnashes Walter's portrait, he gets revenge with a titanium sausage that leaves Gnasher toothless and miserable. Dennis and the gang decide to stage a heist to 'borr ...
11-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 27. Freewheelin'
It's the famous Beanotown Freewheeler Derby! During practice, the gang realize Walter's go-cart is especially speedy. Worried that Walter will beat his record, Dennis creates a ...
12-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 2: 4. Pranksy
The after-school art club is under threat of imminent demolition. In trying to save the club, the gang end up on the trail of the mysterious undercover urban artist known only a ...
08-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 2: 10. Bertiesitting
Eager to prove her babysitting ability for a permit, Gran’s on the hunt for a baby stand-in. Walter is suspiciously all too willing to offer up Bertie. Can the gang help G ...
11-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 2: 5. Blamjitsu Sensei
Convinced that Mrs Creecher is secretly a master of Blamjitsu, JJ persuades the gang to help trick her into revealing her blam credentials.
08-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 4. Raiders Of The Lost Sweetie
Mrs Creecher confiscates Dennis' rare sour sweetie, the Tongue Destroyer! Dennis is desperate to get the sweet back and takes his friends on an adventure to the school's Confisc ...
07-09-2025
CBBC
Dennis & Gnasher Unleashed!
Series 1: 28. Were-walter
There's a werewolf-type creature on the prowl and suspicion falls on Gnasher. Dennis has to prove his best pal's innocence as the full moon shines down on Beanotown...
08-09-2025
CBBC