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The Master Prank Caller, as his name suggests, is the master of prank calls. He can prank anyone at anytime by talking to them on a phone. He is a large 80's style cell phone with human arms and legs. He is later revealed to be a man in cell phone armour, although he most likely is of inhuman origin because he is capable of performing strange feats of magic - just by dialing numbers on himself, he can get anything he wants (limo, 80's clothes, etc.). He can even send prank-callers he pranks to various years in the past. He also (underneath his phone armour) vaguely resembles an alien like ET.
He first appears in the episode "Prank Callers", pranking an old lady on the internet. Mordecai and Rigby decide to be prank-callers like him and try to prank him. However, it goes wrong and they are transported to 1982 by him. They try to return to the present by sending Benson, Pops, and Skips there to help them prank the Master Prank Caller. After a long chase, they stop him and return to the present through a place filled with doors and a specific year is labeled above each. They find the door, and before they go home, listen to a heartfelt speech from the Master Prank Caller's decaying body. In the end of the episode, Mordecai, Rigby, and the Master Prank Caller became acquaintances, and all three prank called Benson.
The Master Prank Caller is a white 80's-esque cellphone, and has human arms and legs. It is later revealed that he is a decaying body inside.
- Sam Marin and Tim Curry were not the original actors in mind for the role; James Earl Jones, known for providing the voice of Darth Vader in the Star Wars films and Mufasa in The Lion King, was the original choice, but was not able to voice the character for unknown reasons.
- The Master Prank Caller may have somehow inhabited the 1980s (possibly '82), since he is an 80s-esque cellphone.
- He has the power to call people with the buttons on his body.
- Goofs: His past self was shown to fight as one of the fallen enemies in "Exit 9B", despite having an acquaintanceship with Mordecai and Rigby, and never died on-screen.