|Speed-o'-Sound Sonic vs. Deep Sea King|
|Villain Speed-o'-Sound Sonic||Monster Deep Sea King|
|Deep Sea King
|Sonic is uninjured||Deep Sea King is uninjured|
|Previous||Puri-puri Prisoner vs. Deep Sea King|
|Next||Sneck, All Back-Man, Jet Nice Guy and Bunbunman vs. Deep Sea King|
Speed-o'-Sound Sonic vs. Deep Sea King is the battle between the assassin Speed-o'-Sound Sonic and the demon level monster Sea King.
Sea King attacks Sonic but Sonic dodges and counters with wind blade kick. Sea King unleashes his Moray which rips Sonic's shirt but Sonic forcibly closes Sea King mouth cutting off moray. Sea King then proceeds to attack but Sonic dodges every attack. Sonic then counters with his own barrage of attacks and jumps up a building. Sea King then attacks with Sonic noting his speed increased. Sea King is shown to have transformed due to the rain increasing his size and abilities and he stated that Sonic's attacks were completely ineffective. The scene shifts to Sonic attempting to escape the newly empowered Sea King. It appears that Sea King captured Sonic but it is revealed that Sonic ditched his clothes and escapes vowing to gather weapons and come back to kill Sea King.
Saitama sees Sonic and goes after him, thinking he's a civilian. Sea King finds the shelter and attacks it.