重返恶夜魔境/爸爸的小怪兽

〈重返恶夜魔境/爸爸的小怪兽〉（"Return to the Nightosphere / Daddy's Little Monster"）是《探险活宝》第四季的第5及6集。在卡通频道2012年4月30日播出。本集以阿宝和老皮为主角。在〈重返恶夜魔境〉，阿宝和老皮发现自己被困在由艾薇尔的父亲亨森·阿巴狄尔所统治地狱般的世界，恶夜魔境，他们不记得到这里的方式。在〈爸爸的小怪兽〉，阿宝和老皮发现，亨森·阿巴狄尔把艾薇尔变成一个巨大的恶魔。两人挽救艾薇尔。
"Daddy's Little Monster" features several songs, including "Not Just Your Little Girl", written by Sugar. Sugar and Sanchez originally tried writing the song—which was originally to be called the "Cone Zone"—together, but Sugar eventually completely rewrote it. When it came time to storyboard the episode, Sanchez with the help of former storyboard artist and then-creative director Adam Muto, storyboarded the scene, and Ward asked Sugar to record a quick demo of the song for reference. She filmed herself recording the demo, but jokingly noted that she asked "Pen and Cole to face the other way" out of embarrassment. The political rap featured in "Daddy's Little Monster", written by Moynihan, was originally intended for "Return to the Nightosphere", but was cut for time. Sugar, however, liked the song so much that she insisted it be added to "Daddy's Little Monster". Moynihan was pleased with the largely positive critical reception the rap had from fans of the series.
Martin Olson, the father of voice actress Olivia Olson, reprises his role as Hunson Abadeer in this episode, as well as "Daddy's Little Monster"; Olson had previously appeared in the second season premiere "It Came from the Nightosphere" and the third season episode "Memory of a Memory". The episode was also the first to give a name to Marceline's father: Hunson Abadeer. According to Moynihan, the name was inspired by the name that his brother had given their family's car when they were growing up. The two later used it for a band that only recorded one song. To create the demonic effect of Marceline talking while possessed with the amulet, Olivia Olson and her father were required to say their lines in tandem. She later explained: "We were going back-and-forth, line to line … We were screaming back and forth at each other, and trying to match pitches and stuff. Then, hearing the after product of both of our voices blended together was pretty fun."
Reception.
"Return to the Nightosphere" and "Daddy's Little Monster" first aired on Cartoon Network on April 30, 2012. Together with other episodes of Cartoon Network programming, the episodes helped make the network the number one television destination for boys aged 2–11, 6–11, and 9–14 on Monday nights, according to Nielsen ratings. The episodes first saw physical release as part of the complete fourth season DVD in October 2014.
Phil Dyess-Nugent of "The A.V. Club" awarded both "Return to the Nightosphere" and "Daddy's Little Monster" an "A", noting that, "If the last few episodes of "Adventure Time" … struck anyone as being a little short on adventure, or, at least, action, tonight’s epic two-parter went a long way toward making up for it." He applauded the installments embracement of dark humor, as well as its fixation with striking visual designs, describing the titular Nightosphere as "a goofed-up Hieronymous Bosch landscape". In regards to "Daddy's Little Monster", Dyess-Nugent noted that the high-point was the "freestyle political rap" that Finn and Jake ad-lib to get the demons to help them.
In an interview with "The Mary Sue" on August 2, 2013, Olivia Olson claimed that both "Return to the Nightosphere" and "Daddy's Little Monster" were the most fun episodes for her to record, largely due to the manner in which she and her father had to record their lines in tandem.