Commander Derrick is an major character in Super Smash Bros. Crossover. He is an Bob-omb Buddy who serves as the general of the Bob-omb Buddies. He appears in Season 1 when he helps Master Chief, Link, Kirby, and Yoshi fight against The Covenant whom are being allied by League Of Six Kingdoms and later becomes an supporting character. He is the mentor of Meta Knight, Sirica, Blade Knight, and Sword Knight and is also the companion of Sergeant Johnson and Spartan David.
Derrick debuts in Season 1 where he is training with the Bob-omb Buddies, Derrick suddenly sees Mario, Luigi and Wario approaching him cowardly and tells him that an alien organization known as The Covenant are invading Mushroom Kingdom. Initially the Bob-omb Buddies believe that the Black Bob-ombs are engaging war with the Bob-omb Buddies again with Derrick deciding they should investigate it. Derrick along with Mario, Luigi, Wario and his Bob-omb Buddies investigate the incident occurring in Bob-omb Battlefield, Derricks prepares Bob-omb Buddies to engage combat, however when their enemy approaches Derrick sees that instead of facing the Koopa Troop, the Derrick and his Bob-omb Buddies encounter an massive army of Grunts, Elites, Jackals, and Hunters being affiliated by the Covenant. Outnumbered by the alien empire's massive army, Derrick along with Mario and his friends were unable to counter the powerful alien army who outnumber the Bob-omb Buddies and are forced to flee. Suddenly they are ambushed by an group of savage warriors known as the League Of Six Kingdoms who easily defeat Mario, Luigi, and Wario but allowed Derrick to escape. Bowser discovered this and jumped to attempt to defeat the League Of Six Kingdoms but was overpowered by the vicious Barraki and retreated. Derrick later explained to Master Chief, Link, Kirby, Yoshi, and Tahu about the previous incident of The Covenant invading Mushroom Kingdom, he assists them into fighting against The Covenant where they eventually reach the Covenant ship Truth and Reconciliation where they battle against the League Of Six Kingdoms alongside their leader Pridak.