Harold (Leader Plankton!)

Harold William "Bill" Reginald is a light blue fish who wears a white shirt and a red Speedo that appears in the popular spin-off series, Leader Plankton!. He has extreme anger issues and is very ill tempered.

Season 1

 * 106. "The Big Cook-Off" (cameo)
 * 109. "Wanted: The Black Sponge" (cameo)

Season 2

 * 205. "The No Thanks-Giving Gifts To Leader Plankton Special" (cameo)
 * 212. "The Black Sponge Is At It Again" (cameo)

Trivia

 * Black Sponge tends to call him a random guy which makes him rage.
 * The "Random Guy" gag was a reference to the SB episode, Planet of The Jellyfish.