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I'm the Big Bob-omb, lord of all blasting matter, king of ka-booms the world over! How dare you scale my mountain? By what right to do you set foot on my imperial mountaintop? You may have eluded my guards, but you'll never escape my grasp... And you'll never take away my Power Star. I hereby challenge you, Mario! If you want the star I hold, you must prove yourself in battle. Can you pick me up and hurl me to this royal turf? I think you cannot!
~ King Bob-omb in Super Mario 64.
King Bob-omb, sometimes called Bob-omb King or Big Bob-omb, is the king of the Bob-ombs and a recurring antagonist of the Super Mario franchise. He is the first boss who is fought in Super Mario 64 and Super Mario 64 DS. Guarding the Power Star, which Bowser entrusted him with, he will not give it up without a fight.
In Super Mario 64, Mario merely has to run around to the back of him, pick him up, and toss him three times. Only then will he give up the Star. If he is thrown off the mountain, he will accuse Mario of cheating and he will have to start over. (Even though Big Bob-omb sometimes DOES throw Mario off the mountain himself) He is super-kind for elders, a trait not seen in many Super Mario series characters.
Super Mario 64 DS
In Super Mario 64 DS, he is fought twice. The first time is as Yoshi, and instead of picking him up, Yoshi had to grab the Bob-ombs thrown at him with his tongue and spit them back at him before they explode in Yoshi's mouth. After being hit by three Bob-ombs, he is defeated. The second time, he can only be defeated by one of the three plumbers and use the same strategy used in Super Mario 64.
Mario Kart series
King Bob-omb appears as a boss in Mission Mode of Mario Kart DS. He is the boss of the fifth level and fought against Wario.
He also appears in Mario Kart Tour as the mega boss in the end of the Wild West tour where King Bob-omb must be raced on N64 Kalimari Desert 2 where the player has to get first place in order to win. King Bob-omb also appeared alongside Pirate Bowser Jr. as playable characters in the Pirate Tour as a High End character.
Mario & Luigi
King Bob-omb makes his RPG debut in Mario & Luigi: Paper Jam as the boss of Mount Brrr, in charge of the paper terrain operation under orders from Bowser. When the Mario Bros. discover his plans, he threatens to blow up. If he is not defeated under four minutes, he explodes causing massive damage, potentially enough to kill all party members and cause a game over. Countering his bomb attacks at the right time can cause the timer to malfunction and be set back by a minute, much to King Bomb-omb's shock. After his defeat, King Bob-omb boasts about how he cannot be defeated due to his stylish mustache, but then comments that the Mario Bros. also have mustaches.
Other Super Mario game series
King Bob-omb also appears in many other Super Mario games, including Mario Party and Mario Golf.
Super Smash Bros.
King Bob-omb appears as a trophy in Super Smash Bros. for Nintendo 3DS and a spirit in Super Smash Bros. Ultimate. For the latter case, he is an advanced class primary attack type with his ability increasing the power of grabs and tosses. He can be obtained by summoning him with the cores of a Bob-omb and the Shake King, or by defeating him in a spirit battle against a giant Kirby on Peach's Castle that throws Bob-ombs at the player.