Justin first appeared in episode 8, where Leopold's dad, Harold, was sent a music video by his co-worker John. Harold became a Belieber since then. When he return home and played the music, Leopold cannot hold it and then smashes the keyboard. Then Leopold and Leonard broke Harold's music player and got beaten.
In episode 11, Leopold found some Bieber fails video and sent it to Harold, thus he reveals that Bieber is a fail, and becomes hateful to Justin.
In episode 20, Hitler teamed up with Leopold to kill Justin by putting a bomb in his concert.
In the first movie, he revived and founded the BFA, and tried to attack Germany. Leopold, Harold and Hitler teamed up and fought Justin back.
In episode 36, when Leopold went to a new school, Principal Dikshitt, who's under Justin, has awaited Leopold and kidnapped him. One the way to Justin's basement, TheShaneDawsonFan noticed Leopold carried by Dikshitt, and then he contacted Fegelein for help.
In episode 47, he is Leopold's new teacher as soon as the school was reopened. In episode 49, Leopold tried to fight him but failed. In episode 50, after getting help by TheKewlOne96, he successfully beaten Justin and made him flee.
Justin appeared in the in the late of the second movie, where Justin has been rebuilded into a huge android. Justin was finally defeated and permanently destroyed, ending the appearances of him.
|1st Time||Movie 1||ARK Music Factory||300|
|2nd Time||Episode 36-38||Justin Bieber's Basement||300 + 600 + 900|
|3rd Time||Episode 49||Leopold's School||500|
|4th Time||Episode 50||Leopold's School||500|
|5th Time||Movie 2||Cyber||1000|
In episode 55, Leopold once wrote an essay regarding the worst singer ever. He called Justin "Justin Buttfucker" and eventually get punished.
It's known that Mrs. Sukscox loves Justin's music. She was unhappy when he saw Leopold's essay.
Justin Bieber only appears as a SPOILER alert like Donald Trump.
Justin Bieber debuts on AGK in Europe as he plans to brainwash all girls in the world by his hypnotizing machine weapon instead of listening his song because it's copyright and he kills anyone who opposed to him with his hi-tech weapon. after the "World Tour Saga" episodes, Nova replaced him as the main antagonist.
- Chris Wong plays kill Justin Bieber game (in real life) and he dies in episode 161.
- In Margaretka4356's series, Aerial Slikk gets Bieber Fever, and Xenia likes to listen to his music, and Leopold's classmates Sarah and Sandra love him.
- He was declared a persona non grata by the government of the Philippines for posting something on Instagram that was deemed racist.
- As seen in episode 11(TheKewlOne96) It showed that Justin Bieber doesn't know what German means, which explains how Harold started to hate him.