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"It's Squidward, silly!"
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In "The Fry Cook Games", Harold is the final torchbearer who carries the Olympic Flame to the site of the 21st Annual Fry Cook Games to light the giant burger and officially begin the event. However, the flame is put out by a gust of wind before he can do so, and he is forced to run to the stadium again. He successfully lights the burger, but is then inexplicably engulfed in fire himself.
In "Friend or Foe", he was among the people who were waiting to buy a burger from young Krabs and Plankton.
In The SpongeBob SquarePants Movie, he makes a cameo appearance as one of the Bottomites in the Chum Bucket getting a free bucket helmet. He later falls under Plankton's mind control because of the helmet and eventually get's freed by SpongeBob with his magic guitar blaster.
In "Earworm" he thinks SpongeBob is tricking him while singing, but SpongeBob tried several so it accidentally occurred that the Krabby Patties were exposed in double and served behind Abigail's table.
In "Grandma's Kisses" he and other blue fish were laughing at SpongeBob about a kiss on his forehead.
In "No Hat for Pat" he gets grossed out by SpongeBob blowing nose on his fin.
In "Once Bitten," Harold's most prominent appearance, he is one of the refugees hiding at the Krusty Krab after Bikini Bottom is overrun by zombies, due to Mad Snail Disease. He is married to Evelyn, and he becomes the de facto leader of the fish when Evelyn faints, and wants to kill Gary to stop the disease, but he doesn't when it is revealed that all Gary had was a splinter.
In "Pet or Pests" he and Tyler briefly get confirmed on the background seen going out of the supermarket.
In Karate Star it was revealed that he works at the lemonade stand while he got surprised from SpongeBob and Patrick practicing their individual karate competition.
In "Tunnel of Glove" he is Shubie's boyfriend as they ride on a roller coaster, although Shubie is later seen with Nat, later he briefly appears in major situation where he was apparently trapped in line along with other fish stepped by Patrick trying to rescue SpongeBob along with Pearl.
In "SpongeBob vs the Big One," he thought that Sandy was a spaceman, jabbing her with pitchfork and making Sandy annoyed.
In "Are You Happy Now?," he attempted to be the first one to climb Mt. Bikini. However, he was greatly upset that SpongeBob and Squidward made it to the top first, gives SpongeBob his flag, and angrily hikes back down. He was seen again getting knocked back down the mountain due to an avalanche.
In "License to Milkshake," he orders a milkshake from SpongeBob but it is frozen. He then demands a refund. He was seen again where he was pleased to have a properly made milkshake.
He was seen briefly in "Little Yellow Book" where he was standing in line at the Krusty Krab waiting to order a Krabby Patty.