season episode "Fish-N-Chumps" was co-written and directed by Hillenburg, and involved Rocko, Heffer, and Filburt going on a fishing trip, oblivious to the fact that a pair of anthropomorphic sea creatures are attempting to catch them from underwater; this would foreshadow his later work with SpongeBob. In 1995, during the fourth and final season of Rocko, Hillenburg was promoted to creative director, where he helped oversee pre- and post-production. Working on the series enabled him to repay his loans. He later related that he "learned a great deal about writing and producing animation for TV" from his stint on Rocko's Modern Life. SpongeBob SquarePants Creation Some evidence shows that the idea for SpongeBob SquarePants dates back to 1986, during Hillenburg's time at the Orange County Marine Institute. He indicated that children's television series such as The New Adventures of Mighty Mouse (19871988) and Pee-wee's Playhouse (19861991) "sparked something in [him]." He continued, "I don't know if this is true for everybody else, but it always seems like, for me, I'll start thinking about something and it takes about ten years to actually have it happen, or have someone else believe in it... It took me a few years to get [SpongeBob SquarePants] together." During the production of Rocko's Modern Life, Martin Olson, one of the writers, read The Intertidal Zone and encouraged Hillenburg to create a television series with a similar concept. At that point, he had not even considered creating his own series: "After watching Joe [Murray] tear his hair out a lot, dealing with all the problems that came up, I thought I would never want to produce a show of my own." However, he realized that if he ever did, this would be the best approach: "For all those years it seemed like I was doing these two totally separate things. I wondered what it all meant. I didn't see a synthesis. It was great when [my two interests] all came together in [a show]. I felt relieved that I hadn't wasted a lot of time doing something that I then abandoned to do something else. It has been pretty rewarding," Hillenburg said in 2002. He claimed that he finally decided to create a series as he was driving to the beach on the Santa Monica Freeway one day. As he was developing the show's concept, Hillenburg remembered his teaching experience at the Orange County Marine Institute