Quote1 I'm Rockslide, and I can't be scared or killed. If you go crazy evil or something, I'm the one that's going to take you out. Quote2
-- Rockslide src
Santo Vaccarro (Earth-616) from New X-Men Hellions Vol 1 1 0003


New X-Men: Academy X

Santo Vaccarro was sent to the Xavier Institute where he befriended Hellion and the would-be Hellions Training Squad. He was originally advised by Iceman, but was selected by Emma Frost to be part of her prized Hellions squad. Santo and the rest of the Hellions went on to win the Field Day Tournament and were declared the best squad at the end of the school year.


During the summer vacation, Julian, from a well-to-do background, invited his friends to his home. The Hellions ran into trouble quickly, as his and Mercury's appearances along with Dust's dress disturbed people at the airport. After a brief struggle, the group was allowed to board, and made their way to California, where Julian originates. Soon, the team encountered the Kingmaker, from whom they each received a trial wish. Santo's wish was to become a World-class Champion in superhuman wrestling. However, when the Hellions eventually refused a permanent deal with the Kingmaker, the Kingmaker shattered Santo with a laser blast. Julian used his telekinesis to piece Rockslide back together, and together the Hellions defeated the Kingmaker.

Decimation & Childhood's End

Soon after returning to the school after the vacation, the Scarlet Witch created the reality known as the House of M. In this reality, Santo was once again a champion superhuman wrestler. After the effects of M-Day, he was one of the few students who didn't lose their powers. The depowered students and staff were sent to their homes. One bus was bombed by anti-mutant religious zealot Reverend William Stryker, and Santo's former teammate and friend Tag was among those killed. The X-Men held a funeral for those students whose parents would not accept them, and Santo reflected upon how he had "failed" by not being able to save those killed.

Santo Vaccarro (Earth-616) from New X-Men Vol 2 36 0001

Rockslide's new form

With the mutant population drastically decreased, the government sent the Sentinel O*N*E* Squad to watch over the school, which began housing as many remaining mutants as would take refuge. All of the remaining students were placed by Emma Frost into an all-out brawl, and the ones deemed to be the best were to be assigned to become a group of in-training X-Men. Santo made the team and began training to become an X-Man.

William Stryker continued his terrorist attacks against the school. Santo's teammate Elixir ended Stryker's plans by killing him. The New X-Men, with the help of Prodigy, then made the connection between Stryker and Nimrod. The team leader, Surge, then decided that the team would find and destroy the robot. When the team confronted Nimrod, Rockslide was obliterated in the battle. Hellion and Mercury tried desperately to awaken and to piece him back together, but Rockslide's remains were initially unresponsive. Thankfully, even in his shattered form, he was able to survive, and was finally put back together, only to become larger and more rugged than his previous form. Rockslide is later seen talking to Match and Anole about their abilities and how useful or non-useful they would be if they joined the New X-Men team, indicating Match and Anole may be possible candidates for admission onto the team. He was at the memorial service for all the students lost at Strykers attack on the institute.

Santo Vaccarro (Earth-616) from New X-Men Vol 2 40 0001

Rockslide while in Limbo

Recently, Rockslide saw the Young Avengers on television, learning about them for the first time, to his fellow students' surprise. He decided that the New X-Men should beat them up, with himself fighting Hulkling. Fellow students Loa and Anole told him that Hulkling would win.

Mercury Falling & Quest For Magik

Rockslide accompanied the X-Men when they jumped from the Blackbird to save Mercury from the Facility. He helped with great enthusiasm during the fight, and in the aftermath, made fun of Shadowcat and her powers, saying that being an X-Man must be "really hard". Kitty then jokingly threatened to kill him.

Santo and the other students were captured by Belasco, and taken to Limbo. While hiding from Belasco, along with Blindfold, Match, Loa, Anole, Wolf Cub, Pixie, and Gentle, Santo was unsure what to do. As demons approached the group, Santo fought them off, but then seemingly exploded when he tried to shoot his fists at them. Santo then seems to reconstitute himself in a magma rock form that is also impervious to magic and beats the badness out of Illyana who then helps them to rescue their fellow students and kill Belasco. Back home Rockslide threatens to quit if Pixie and Anole aren't made part of the New X-Men.

World War Hulk

Rockslide is one of the New X-Men that went up against the Hulk. He knocked over the Hulk so the other students could hold him down, but is knocked away when Hulk regains his strength. When Rocklide attacked him alone, it appeared that Hulk knew who he was and what he could do. He ripped off both his arms, stepped on him, then tore off his legs. He then got rid Rockslide of his limbs by throwing them a great distance, preventing Rockslide from using his powers and the ability of ambulatory function. Ironically, Santo had stated that as a kid he pretended he was the Hulk.[2]

Children of X-Men

Rockslide was playing pool with X-23 and Anole; he and X-23 tried to convince Anole to let them cut his other arm off. After Santo called Anole a sissy, Anole got offended and pushed him out the window while Rockslide proclaimed "I swear I didn't know! Don't be so sensitive!" After Rockslide refused to blow himself up, Anole called him a sissy to get him to do it. Anole then offered to try and blow up Santo himself.[3]

Santo later agreed to stay up with Indra because he was worried that he was going to die and while having an indoor campfire, Santo pointed out that it doesn't matter how old they are, they are mutants and someone is going to come gunning for them, and when they do he wants to go down fighting. Later, he outed Anole as gay to some of the other students, though Loa was already aware and said that everyone already knew of his orientation.[4]

Young X-Men

After the X-Men were disbanded,[5] Rockslide was in Florida when Blindfold found him and explained her vision of their Young X-Men team. When Donald Pierce (impersonating Cyclops) offered Santo a spot on the team, but agreed to join only if Blindfold was also accepted. The other young mutants recruited were Santo's former classmates Dust, and Wolf Cub and newcomer Ink.[6]

During their first adventure, the Young X-Men battled the New Mutants and revealed Donald Pierce's charade. Unfortunately, Wolf Cub was killed, an event that hit Santo especially hard.[7] Santo took out much of his anger on Cyclops, but still agreed to join the X-Men in San Francisco.[8]

Rockslide was one of the only Young X-Men to remain a full-time member. He participated in defeating the Y-Men[9], the revelation of Cipher[10], and the battle with the Neo on the Golden Gate Bridge.[11]

When Dust seemingly died, Rockslide went into a berserker rage and almost killed Donald Pierce again. Santo seemed to be moved the most by the death of his friend and was filled with enjoy when she was revived.[11]

Secret Invasion, Utopia & X-Infernus

During the Skrull invasion of Earth, Rockslide was teamed with Angel in battle.

Later, along with Hellion, Rockslide was one of the mutants inciting the riots in San Francisco during Simon Trask's Humanity Now! and Proposition X rallies.

While Santo and Mercury were watching a training session between Pixie and Nightcrawler, Pixie stabbed Kurt with her Souldagger. They ran in and moved Pixie away from Kurt's unconscious body. When Beast entered Pixie regained her senses. When she removed her dagger, Magik's Soulsword emerged from Kurt's chest and Magik teleported in ready to reclaim her sword.

Rockslide took on Illyana, thinking he was still resistant to magic, forgetting that it was only when he was composed of Limbo's terrain. Illyana shocked him by easily defeating him. After he reformed, the gathered X-Men held a meeting and he along with Mercury were put on a team of X-Men being sent to Limbo due to their resistance to magic, but only if he reformed from Limbo rock.

In Limbo, Rockslide reformed out of Limbo's terrain as the team entered Belasco's castle to assist Pixie. Finding Illyana defeated by Witchfire and Pixie transformed into a demon, Rockslide and Mercury were forced to fight Colossus and Wolverine who became magically mind controlled.[12]

Schism & Regenesis

After the Schism, Santo went to Westchester along with many other mutant students.

Death of X

After Cyclops telepathic call to arms against the Inhumans, Santo was seen at Muir Island to bury and mourn the mutants who died from the Terrigen Mists[13]. Later, he joined Cyclops team who were sent to contain the Inhumans and Storm's team.[14] After the death of Cyclops and the negotiations with the Inhumans that lasted for a whole week, Santo attended Cyclops funeral with the rest of the X-Men.[15]


Geokinetic Psychic Entity: Santo's body is composed completely of inorganic granite. When Santo was first shattered by the Kingmaker and put back together by Hellion,[16] it was much like how Emma Frost in her diamond form was reanimated by Jean Grey.[17] Santo's body was next obliterated by Nimrod, only to eventually put itself partially back together (Santo needed Julian's help again to fully reform). This time his appearance is larger and more rugged.[18][19] The third insistence where Rockslide's body was destroyed, was in Limbo. However, this time returning as a large lava/magma elemental type creature. It is unknown whether this is able to be controlled or if it is a passive regenerative ability that occurs when Rockslide's body is destroyed.[20][21] After this episode, it is hypothesized by Beast that given Santo's three experiences reforming his body after being destroyed, Santo is actually a non-physical psychic entity that can form and control a stone "golem".[3]

Henry McCoy (Earth-616) and Santo Vaccarro (Earth-616) from New X-Men Vol 2 42 0001

Rockslide reforming his body in front of Beast

  • Rock Explosions & Rock Projectiles: Santo once was able to fire "granite projectiles" using his appendages, but now has the power explode on command and reform himself from any surrounding rocks. His projectiles were fired with Level Five Force.[22]
  • Superhuman Strength: Rockslide has continuously been shown performing great feats of strength. Rockslide possesses superhuman strength. He is capable of lifting 75 tons.
  • Superhuman Stamina: Rockslide's musculature generates less fatigue toxins during physical activity than the musculature of an ordinary human. He can exert himself at peak capacity for at least several hours before fatigue begins to impair him.
  • Superhuman Durability: Rockslide's extremely dense bodily tissue is considerably harder and more resistant to injury than the body of an ordinary human. He can withstand great impact forces, high caliber bullets, temperature and pressure extremes, and falls from great heights without sustaining any injury.

Rockslide was considered a General Threat by the O*N*E, at the time of the M-Day.[23] Nimrod classified him as a Threat Level: Medium,[19] and after defeating him, he was red-flagged and allegedly reclassified by the O*N*E.[22]


  • Combatant: Rockslide is a good hand to hand combatant.

Strength level

  • Rockslide is capable of lifting within the class 75 range.


  • Energy Blasts: He can be split into pieces by powerful energy blasts from enemies such as Nimrod.
  • Geokinesis: Because Rockslide's body is composed of rock or earth, he is susceptible to others who control rock materials like Magma.[24]
  • Rock Separation: If parts of his body are ripped off and thrown very far away they will not come back, as demonstrated by Hulk.[2]


X-Men's Blackbird or X-Jets.

Santo Vaccarro (Earth-616) from Young Avengers Vol 2 12 0001


  • Santo has formed very close friendships with Victor, Cess, Julian, Ruth and Nicky; however, he is friendly with most (if not all) of the young mutants.
  • The idea of Santo desiring to be a world-class wrestler has reoccurred twice: once in the New X-Men: Hellions Vol 1 and again in the House of M reality.
  • Santo once highly respected the Hulk and even pretended when he was playing "super hero battles" as a child,[2] but changed opinion when the Hulk attacked the X-Men.[2]
  • Rockslide has said he'd like to take on Hulkling.[25]
  • Rockslide has performed some kind of sexual harassment on some female characters wearing suggestive costumes. Examples include Ms. Marvel[18] and Transonic.[26]
  • Rockslide lacks genitals.[1] He proved it by showing naked at the battle between the Young Avengers and the Thin Spandex Line (a gathering of teens and young adult heroes), and the numerous alternate Young Avengers of Mother.[27]

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