I'm a Celebrity...Get Me Out of Here! returned for its twenty-first series on 21 November 2021 on ITV. As with series 20, due to COVID-19 travel restrictions, the series was filmed at Gwrych Castle in Abergele, Wales.^[1]

Ant & Dec returned to host the series.^[2] In October 2021, it was announced that the online spin-off show I'm a Celebrity...The Daily Drop had been axed, with no plans for a replacement.^[3]

On 12 December, Danny Miller was crowned the first ever ‘King of the Castle’.^[4]

On 2 August 2021, it was announced that, due to Australia's border remaining closed amid COVID-19 restrictions in the country, filming would again be taking place at Gwrych Castle in Abergele, Wales, instead of Murwillumbah, New South Wales, Australia.^[1] As part of the agreement with Gwrych Castle Preservation Trust, ITV announced it would continue to help support the ongoing restoration project of the site.^[1][5]

The first trailer for the series was released on 22 October 2021, featuring Ant & Dec dressed up in knight's armour galloping through the Welsh countryside, whilst it was teased that the series would be "more gruelling than ever".^[6]

The live elements of the show on 26 November had to be pre-recorded for the first time in the show's history due to adverse weather conditions from Storm Arwen.^[7] On 27 November, the celebrities were temporarily removed from the castle and the episodes on 27, 28 and 29 November were cancelled due to safety fears and technical difficulties as a result of the storm.^[8][9] The show resumed on 30 November.^[10]

The line-up was announced on 15 November 2021.^[11] Adam Woodyatt and Simon Gregson were confirmed by ITV on 24 November as the annual late arrivals.^[12] On 25 November, Richard Madeley was forced to withdraw from the series after being taken to hospital due to an unspecified illness, and therefore breaking the show's COVID bubble. Posting online, Madeley said: "I started to feel briefly unwell in the small hours of the morning and was taken to hospital as a precaution."^[13]

  Indicates that the celebrity received the most votes from the public

  Indicates that the celebrity received the fewest votes and was eliminated immediately (no bottom two)

  Indicates that the celebrity was named as being in the bottom two

• ^Note 1: The public voted for who they wanted to win, rather than save.

The contestants take part in daily trials to earn food. These trials aim to test both physical and mental abilities. The winner is usually determined by the number of stars collected during the trial, with each star representing a meal earned by the winning contestant for their fellow celebrities.

  The public voted for who they wanted to face the trial

  The contestants decided who would face the trial

  The trial was compulsory and neither the public nor celebrities decided who took part

More information Trial number, Air date ...

Trial number	Air date	Name of trial	Celebrity participation	Winner/ Win or Loss/ Number of stars	Notes
1	21 November	Walk the Plank	Danny Louise Naughty Boy Snoochie	Louise Snoochie	—
2		Hell Holes	Arlene David Kadeena Matty	Kadeena Matty
3	21 November	Turrets of Terror	Frankie Richard	Frankie	2, 3
4	22 November	Dreaded Diner	Danny	Danny	3 4 5
			Snoochie
5	23 November	Treacherous Traps	Snoochie	Snoochie	3 6
			Naughty Boy
6	24 November	Castle Kitchen Nightmares	Richard		—
7	25 November	The Scare Fair	Adam Simon
8	26 November	Creepy Closets	Naughty Boy		7
9	30 November	Bedchamber of Chills	Arlene Kadeena
10	1 December	Savage Stakeout	Naughty Boy		7 8
			Adam Simon
11	2 December	Castle Scary-Oke	Frankie Naughty Boy		—
12	3 December	Gruesome Gargoyles	Matty Naughty Boy
13	4 December	Cells of Hell	Adam David Naughty Boy
14	5 December	Gross Vegas	Naughty Boy		9
			Matty
15	6 December	Critter-Cal Cages	Kadeena Louise		—
16	7 December	The Grim Grinder	Frankie
17	8 December	Santa's Grotty Grotto	Danny Simon
18	9 December	Drawbridge Over Troubled Water	Danny David
19	10 December	Lethal Latrines	Matty
20	11 December	The Celebrity Cyclone	Danny David Frankie Simon
21	12 December	Fill Your Face	Danny
22		Frightening Feast	Simon
23	Tomb of Doom	Frankie

Close

• ^Note 2: For the first time in the show's history, the vote for the first trial opened a week before the series began, with the public deciding who would be facing the first trial. The winning celebrity would move their team into Main Camp, while the losing celebrity's team moved into the Castle Clink - where they slept on the floor and endured cold showers until the camps were merged on Day 4.
• ^Note 3: The celebrities competed in this trial to win meals for their camp, while the losing team spent the night with basic rations of rice and beans.
• ^Note 4: As both Danny and Snoochie completed all 10 dishes (5 each), a tie breaker was needed to decide who would win the trial. As Danny finished his drink first, he won the trial.
• ^Note 5: As punishment for losing the first trial, the team in the Castle Clink faced the public vote for this trial. The team in Main Camp chose who faced the trial for them.
• ^Note 6: Main Camp faced the public vote for this trial, then they selected who faced them from the Castle Clink.
• ^Note 7: As lords of the castle, Adam and Simon were exempt from the public vote for trials.
• ^Note 8: Naughty Boy was chosen by the public to compete in the trial, whilst lords of the castle Adam and Simon were told they would participate also.
• ^Note 9: Matty automatically faced this trial after selecting the coin in the Wishing Well challenge.

As well as competing in the trials, celebrities have to complete 'Castle Coin Challenges' in order to earn treats for themselves. At least 2 celebrities will be chosen to compete in the challenge. They must complete the challenge they have been given in order to win 'Castle Coins'. After completion of the challenge, the celebrities will take the Castle Coins and head to the Ye Olde Shoppe, where they will purchase one of two snack options, from Kiosk Cledwyn. But, before they are allowed to take the prize, the other celebrities back at the living quarters must answer a question, based on a recent survey. If they get the question right, they will earn the treat, but if they get it wrong, the celebrities will go back empty handed.

  The celebrities got the question correct

  The celebrities got the question wrong

  No challenge or questions were given.

• ^Note 10: Danny, Matty and Snoochie were chosen to compete in a challenge to win 20 Castle Coins. After completing the challenge, instead of visiting Ye Olde Shoppe and having to answer a question, lords of the castle Adam and Simon were given a list of treats to choose from, each costing 5 Castle Coins each.

Official ratings are taken from BARB, utilising the four-screen dashboard which includes viewers who watched the programme on laptops, smartphones, and tablets within 7 days of the original broadcast.^[15]