Snape was instructed by Dumbledore to give Voldemort the true departure plan for
Xenophilius Lovegood betrays Harry in Harry Potter and the Deathly Hallows.
Mundungus Fletcher was played by Andy Linden in the film adaptation of Harry Potter and the Deathly Hallows. Daniel Radcliffe, of course, played Mundungus during the "Seven Potters" scene. On the DVD, Andy pointed out that he was amazed by how well Dan pretended to be him.
Sirius Black, revealing this to Harry, said that Mundungus was heavily veiled and disguised as a witch because he had previously been barred from the Hog's Head, and admitted that Mundungus had been tailing Harry.
In Chapters 4 and 5, Mundungus is one of the decoy Harry Potters, and is paired with Mad-Eye Moody. Terrified of the Death Eaters pursuing them, he deserts his post, leaving Mad-Eye to get hit by a Death Eater's killing curse. It's one of the least courageous moves we see throughout the entire book and many battles.
Xenophilius betrays them to the Death Eaters, hoping to free his daughter Luna, whom the Ministry has imprisoned, and they narrowly escape from his house. Harry is tempted to pursue the Hallows and abandon his quest for the Horcruxes.
Harry Potter World on Twitter: "Domhnall Gleeson (Bill Weasley) is Brendan Gleeson's (Alastor 'Mad-Eye' Moody) son.
Timothy Spall as Peter Pettigrew/Wormtail: The Death Eater who betrayed Harry's parents to Voldemort. Imelda Staunton as Dolores Umbridge: Senior Undersecretary to the Minister for Magic and Head of the Muggle-born Registration Commission.
In order to preserve his position as a trusted Death Eater, Severus Snape was forced to tell Voldemort the true date at which the Order planned to move Harry.
According to the films, Hedwig's killer might have been Selwyn, who was known to be pursuing Harry and Hagrid at the time since Hedwig's death in the film happened quite a while into the fight when there was only a couple death eaters following them, or it might have been Stanley Shunpike under the Imperius Curse.
Both Lupin and Tonks die in combat, killed by Dolohov and Bellatrix Lestrange, respectively, leaving Teddy an orphan with Harry Potter as his godfather and Andromeda Tonks as his guardian. JK Rowling has since stated that she originally intended for both Lupin and Tonks to survive.
It is actually because of that statement that Karkaroff discusses the Dark Mark with Snape; he believes that Snape either betrayed Voldemort, or was in a position to betray him, before Voldemort's fall, just as Karkaroff had betrayed Voldemort's followers afterwards.
After Lord Voldemort's rebirth, Karkaroff left Hogwarts and hid in a shack. However, Voldemort and the Death Eaters found him and killed him.
History of Slytherin
The Head of Slytherin is Horace Slughorn (who left the role to Severus Snape for fifteen years before taking it up again in 1996) and the House's patron ghost is the Bloody Baron.
Harry describes Umbridge to Sirius Black, saying that she's vile enough to be a Death Eater, despite not being one. Umbridge is also depicted to be a prejudiced person, despising half-breeds and Muggle-born witches and wizards to the point of firing Hagrid due to his half-giant birth status.
Harry Potter's Biggest Betrayal Makes No Sense. Peter Pettigrew was a member of the Marauders before he betrayed his friends in Harry Potter, but that choice makes no sense. Even more so than the magical elements, the Harry Potter franchise can be defined by its relationships.
A Professor at Hogwarts School of Witchcraft and Wizardry, Snape is hostile to Harry due to his resemblance to his father James Potter, who bullied Snape during their time together at Hogwarts. As the series progresses, Snape's character becomes more layered and enigmatic.
The death eaters now quite effectively used the cruciatus and imperius curse as you might have seen, but why only rarely the avada kedavra curse? It's because it requires strength, powerful magical ability, to be able to use a curse of that magnitude and power, and that too repeatedly during a duel.
It is interesting also to note that Harry does not actually kill Pettigrew, but that Voldemort's gift kills him despite Harry's efforts to save him. Pettigrew's death is a reaction to his own attempt to kill, or at least, disable Harry, coupled with Voldemort's distrust of his own lieutenant.
At different points, Dumbledore possessed all three Deathly Hallows. He won the Elder Wand from Grindelwald, had the Invisibility Cloak in his possession when James Potter died, and wore the Resurrection Stone as it sat in Marvolo Gaunt's ring. Dumbledore's powers are really quite extraordinary!
Used it to sever the hand of a fellow Death Eater, who had been aiming at Remus Lupin's back during the Battle of the Seven Potters, but due to a slip, he accidentally cut off George's left ear instead, leaving him guilt-ridden.
The betrayal here stems again from the idea of "For the Greater Good" – Dumbledore seems to have chosen Harry to die, since he had already been chosen to die once, in order to save the rest of the world… he just never informed Harry of this decision. Whoops.
Mad-Eye Moody
From: Harry Potter and the Deathly Hallows, Chapter Four, "The Seven Potters", p. 43. He dies off-page, meaning the final words we hear from Moody -- "See you all in about an hour at The Burrow" -- have an added poignancy.
Mundungus was paired along with Moody during the Battle of the Seven Potters. When Voldemort attacked them, Mundungus was frightened and disappeared, abandoning Moody, who was killed by Voldemort.
Sometime during the First Wizarding War, Moody lost his eye during a clash with Death Eaters, and had the magical glass eye inserted as a replacement.