|Not to be confused with Greg.|
|—Greg's only words before dying after Mario accidentally kills him, SMG4: Stupid Mario Arcade|
Greg The Alien was a recurring but pivotal character in the SMG4 series.
He was an alien who first appeared on SMG4: Mario Raids Area 51. He was captured by the Federal Bureau of Investigation (FBI), but he was eventually rescued by Mario. He was the president of a planet called Aelion.
He debuted in SMG4: Mario Raids Area 51 when his spaceship landed on a beach where Mario and some other members of SMG4's Gang were playing volleyball. Mario found him and named him Greg and had a fun day with him until the FBI took him to Area 51. Mario, with Shroomy's help, comes to Greg's rescue.
In SMG4: Stupid Mario Arcade, Mario accidentally killed him in a game of Space Invaders. In SMG4: Mario VS Youtube, it is revealed that Greg had indeed died. Mario put a bouquet of flowers near Greg's tombstone.
He made a reappearance in SMG4: The Resurrection, where his corpse was exhumed, and has not yet been decomposed. He was brought to his home planet for resurrection, but the process turn him rogue, forcing the team to destroy the altar. After the altar was destroyed, he yet again lay lifeless; his corpse cradled by Mario, leaving the ending vague.
He was a green alien with black eyes.
- Function as a throwing weapon:
While he was almost never shown speaking, he seemed to enjoy Mario’s company. He may have been dead inside since he never interacted with Mario when he first met him. However, at the end of the blooper, he gives a smile to Mario, showing that he is grateful to hospitality and friendliness.
It's later implied that he was a bit weird, as he somehow changes the Wi-Fi password at Mario's home. He was also responsive from time to time, clapping Mario's performance at one point.
- SMG4: Mario Raids Area 51
- SMG4: If Mario Was in... Minecraft
- SMG4: The Day SMG4 Posted Cringe
- SMG4: Mario vs IT 🤡
- SMG4: SMG4 Runs Out of Memes
- SMG4: Mario Commits Tax Fraud
- SMG4: Meggy Moves In
- SMG4: Mario VS Siren Head
- SMG4: Stupid Mario Arcade /
- SMG4: Mario VS Youtube
- SMG4: The Resurrection
- SMG4: If Mario Was In... Newgrounds
- Greg is the second major character introduced in 2019. The first is Axol and the third is Melony.
- His model originates from the Pro Skater level of Tony Hawk's Underground 2.
- Greg possibly has affiliations with the Aliens from SMG4: Mario Gets His PINGAS Stuck In The Door.
- Greg is the seventh character whose death was taken seriously, the first five being King Bob-omb, his son, Clone Mario, Desti, Francis and New Super Duper Mario Plus Ultra, followed by Spudnick and Axol.
- Greg could be considered a foil to Desti and Axol. While three of them died seriously in arcs, Desti was active and lived for competitions, was an enemy towards Meggy but eventually became her friend, and died in an epic battle in an attempt to save her friends; while Greg was often lazy, became Mario's friend immediately, and died in a freak accident caused by Mario.
- Greg is the second character who died in an arc. The first was Desti and the third being Axol.