Mikhail Baryshnikov first made a cameo appearance in Rasputin vs Stalin, and later in Alexander the Great vs Ivan the Terrible and PewDiePie vs T-Series through reused footage. He was portrayed by PewDiePie on all three occasions.
Information on the cameo
Mikhail "Misha" Nikolaevich Baryshnikov (Russian: Михаил Николаевич Барышников) was born on January 27th, 1948, in Riga, Latvia. He was a Russian dancer, choreographer and actor. He is known to be one of the greatest ballet dancers in history alongside Vaslav Nijinsky and Rudolf Nureyev. After a successful start in the Kirov Ballet in Leningrad, he stopped doing ballet and went to Canada in 1974 to start a career in western dances. After joining many companies (but leaving shortly afterwards), he joined the New York City Ballet as a high rank dancer to learn George Balanchine's style. He then danced with the American Ballet Theatre, where he later became an artistic director there.
Appearance in the rap battles
Baryshnikov appeared in the background when Mikhail Gorbachev said the line, "I had the balls to let Baryshnikov dance, playa!" He also acted as the transition to the next scene, in which Gorbachev said, "Tore down that wall like the Kool-Aid Man! Oh yeah!"
Baryshnikov, alongside Rasputin, Vladimir Lenin, Mikhail Gorbachev, Vladimir Putin, and Joseph Stalin, appeared in Red Square during the line in Ivan the Terrible's first verse, "I'm the first Tsar of all of Russia!"
Baryshnikov appeared in the end credit of PewDiePie vs T-Series, as a representation of PewDiePie. He is also mentioned in the description, which says "Subscribe to Mikhail Baryshnikov" as a spoof of the "Subscribe to PewDiePie" campaign.