Doctor Mikhail Sergeyevich Cossack

Dr. Mikhail Sergeyevich Cossack (Ｄｒ．ミハイル・セルゲイビッチ・コサック) is a Russian robotics engineer member of the Stravinsky Science Academy, and lives with his daughter, Kalinka. In Mega Man 4, he sent a letter to Dr. Light stating that he has created eight Robot Masters (consisting of Bright Man, Dive Man, Dust Man, Drill Man, Pharaoh Man, Ring Man, Skull Man, and Toad Man) and sent them to take over the world, in order to show the world his genius. Mega Man set out to defeat the eight new Robot Masters, and made his way to Cossack's Siberian fortress. Just as he defeated Cossack, Proto Man appeared with Kalinka and revealed the truth: Dr. Wily had kidnapped Kalinka and forced Dr. Cossack to build the robots as ransom. After Mega Man defeated Wily once again, Dr. Cossack built a robotic bird called Beat for him, as a gift for saving his daughter.

Dr. Cossack appears in the "Navi Mode" of Mega Man 5 in the Mega Man: Anniversary Collection to provide gameplay hints to Mega Man.

Cossack Catcher
The Cossack Catcher is the machine that Dr. Cossack uses in the fourth Cossack stage. Its design is based on the UFO prize catchers commonly found in arcades. Its weakness is the Dust Crusher. You can also use the Wire Adapter to do some damage to this machine. To avoid the risk of getting caught by the claw while standing directly under the machine, stand against the step in the boss room and begin firing the wire just before the claw is directly over you. There is also the chance, if the machine is low enough, of hitting it twice with one shot of the wire -- once on the way up, and again on the way back down.

Trivia
Some people believe that Dr.Cossack created Axl from the Mega Man X Series
 * In the same fashion as fellow scientists Albert Wily and Thomas Light, Master Mikhail of the Sage Trinity in Mega Man ZX Advent was named after him.
 * The cartoon series version of Dr. Cain bears a slight resemblance to Dr. Cossack.
 * Dr. Cossack's full name may have come from the last Soviet leader, Mikhail Sergeyevich Gorbachev.
 * Despite being mentioned in Beat's data card in Mega Man & Bass, Dr. Cossack, himself, was absent from the database.
 * One portion of his castle stage layout made its way into Mega Man 10's Endless Stage.