5. Has Martha stalked others?
Donny is shown searching Martha's name online and discovering that she has a history of stalking, having tormented a barrister with a disabled child and her husband.
This week lawyer Laura Wray came forward to reveal that Martha had stalked her and her family for five years.
Laura gave Martha a two-week trial as a trainee solicitor at her legal practice but fired her after a week because of her rude and confrontational behaviour.
This week lawyer Laura Wray (pictured) came forward to reveal that the person Martha is based on had stalked her and her family for five years
After her dismissal, Martha began to bombard the legal practice with threatening phone calls, to the extent that staff were issued with panic alarms. She also made death threats to Laura's now deceased husband, Jimmy Wray, a Labour MP.
Things came to a head when Martha contacted social services to falsely claim that Laura was hitting her then four-year-old disabled son Frankie.
Under the Scottish court system, Laura was able to take out a restraining order against Martha.
On her Facebook page, the woman thought to be the 'real Martha' has since claimed Laura stalked her.
6. Did Martha ever go to prison?
In the series, Martha pleads guilty to three counts of stalking and harassment. She receives a nine-month prison sentence and a five-year restraining order.
In real life, Gadd did not want his stalker to go to jail and she was never convicted of stalking in relation to him.
He says: 'I didn't want to throw someone who was that level of mentally unwell in prison.'
Gadd did report his stalker to the police and said the matter is now 'resolved', but has not explained how.
7. The grooming and rape
On screen Donny is shown being groomed by a high-flyer in the comedy world, who initially positions himself as a mentor.
The man, Darrien O'Connor, meets him at a party at the Edinburgh Fringe Festival and offers to help with Donny's career. Donny starts to visit Darrien's flat where the pair experiment with drugs, including acid and GHB, before Darrien sexually assaults and rapes Donny in the show's fourth episode.
Gadd claims he was raped by a senior figure in the comedy world but never reported the incident to the police or named his attacker. In another of Gadd's award-winning one-man shows from 2016, Monkey See Monkey Do — where he runs on a treadmill while being chased by a large monkey as a metaphor for the heavy burden of abuse — he tells the story of his sexual assault.
Donny is shown, despite everything, going on to accept a job with his abuser. Gadd has hinted he did the same, saying: 'It was showing an element of abuse that hadn't been seen on television before, which is, unfortunately, the deeply entrenched, negative, psychological effects of attachment you can sometimes have with your abuser.'
The storyline led to comedy writer and director Sean Foley being falsely identified as the rapist due to his physical similarities to actor Tom Goodman-Hill, who plays Darrien.
Foley, who has worked with Gadd, has called in the police over the claims, while Gadd said his attacker was not Foley and begged the public to stop attempting to unmask his assailant.
This week author Richard Osman said on his The Rest Is Entertainment podcast that 'people in the industry know who that person is'.
8. Donny's trans girlfriend
Gadd, who is bisexual, has confirmed that he dated a trans woman and that Teri (played by Nava Mau, pictured in a still from the show) is based on the real person he was with
Baby Reindeer's Donny is shown joining dating sites and falling in love with Teri, a captivating American trans woman, whom he initially treats badly and is embarrassed to be seen with, played by real-life trans actress Nava Mau.
Gadd, who is bisexual, has confirmed that he dated a trans woman and that Teri is based on the real person he was with during a spell he refers to as 'the messiness of my early 20s'.
In his Monkey See Monkey Do show he reveals that his rape led to a 'masculinity' crisis and that he never considered he was anything other than straight until that point.
He says: 'I'd fallen for someone who was trans but with that came a lot of questioning and all that unfortunate shame you have when you are young.'
Just like Teri, Gadd's real-life trans girlfriend was harassed and targeted by his stalker which eventually led to their break-up.
9. Donny's public meltdown
Baby Reindeer's Donny is shown competing in the finals of a comedy competition where he has a complete breakdown. With his gags falling flat, he instead launches into a monologue detailing his rape and subsequent stalking. A punter films him on his phone and it goes viral, turning Donny into a star.
This never happened in real life. Gadd actually spoke out about his experiences of sexual abuse and stalking in Monkey See Monkey Do.
Although there are hundreds of videos on YouTube and TikTok claiming to show Gadd's real-life public breakdown, they are just short excerpts from either the original Baby Reindeer or Monkey See Monkey Do scripted stage shows.
10. The name 'Baby Reindeer'
In the show's emotional climax, Donny is seen sitting alone in a bar listening to Martha's voicemails. In one she reveals the devastating reason why she's given him the nickname 'Baby Reindeer' — as a young girl, she had a little stuffed reindeer that she clung to when her parents fought and took comfort in over years of neglect.
Donny, she says, reminded her of that reindeer right down to its 'wee bum'. But the 'real Martha' says she has never owned a baby reindeer toy and never gave Gadd that nickname.
Gadd has never commented on the nickname but has revealed that his stalker sent him many strange gifts including cuddly toys, underwear, , a hat and sleeping pills.