For a certain generation, there are few franchises more riddled with nostalgia than High School Musical, but how do the films rank from worst to best? From 2006-2008, the adventures of Troy, Gabriella, Sharpay, Ryan, Chad, Taylor et al captured the hearts of young audiences, made a star of Zac Efron, and instilled the important message that singing and dancing don't necessarily have to be lame.

High School Musical premiered on the Disney Channel on January 20, 2006, quickly becoming the most commercially successful Disney Channel Original Movie ever produced at the time. A pure-hearted, squeaky clean, unabashedly earnest musical about chasing dreams, falling in love, and marching to the beat of one's own drum, the film inspired a passion for performance and musical theater in young audiences that continues to this day, as well as two sequels. High School Musical 2 debuted in 2007, becoming an even bigger hit than the original and giving credence for the studio to produce a theatrically-released finale, High School Musical 3: Senior Year.

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All three films are zippy, goofy, wonderfully endearing time capsules of the mid-aughts. In the High School Musical franchise, the cynical has no place and squeaky-clean sincerity is the name of the game. Here are the films in the trilogy ranked, from worst to best.

3. High School Musical 3: Senior Year

The only film in the franchise to debut in theaters, High School Musical 3: Senior Year saw director Kenny Ortega swinging for the fences, with a souped-up budget and higher production values. Centering on the gang's last year in high school, this is the most reflective and emotional of the series, as Troy, Gabriella, Sharpay, Ryan, Chad, and Taylor ruminate on where they've come from and where they're going in their final spring musical. Zac Efron's Troy is given the biggest arc, reprising his dilemma of choosing between ball and song, except now on the more macro level of facing the real world. That "macro" approach is true throughout; Sharpay and Ryan sing at one point about how "Bigger is better and better is bigger," but that doesn't always apply to this entry. Catchy and fun as they are, most of the numbers are just blown-up versions of superior songs from the original two. Gabriella and Troy have their typical romantic ballads, Gabriella has her moody (and honestly skip-worthy) solo, and there's a full company finale that tries to supplant the gleeful pyrotechnics of "We're All In This Together" with bittersweet sentimentality.

Of the new songs, the standouts are Efron's "Bet On It" sequel "Scream," a tortured ballad that combines the star's incomparable commitment to the absolute ridiculous with a heavy metal riff on Fred Astaire's dancing on the ceiling number from Royal Wedding; and the Sharpay and Ryan blowout "I Want It All," a shameless ode to excess that both acknowledges and has fun with the film's expanded scale. The rest is still breezy entertainment, but largely missing the small-scale charm that made the original such a watershed hit. This one is for the diehard fans, and those who grew up with the franchise are likely to shed a few tears watching the gang grab their diplomas and join in song one final time.

2. High School Musical 2

High School Musical 2 Cast Picture

The High School Musical phenomenon was so huge that when its sequel debuted in August of 2007, it broke just about every record in the book. Fans of the original had little reason to be disappointed. High School Musical 2 features the return of the entire original cast, transplanting them to Sharpay's country club, where Troy has gained employment for him and his friends for the summer. The plot's conflict largely revolves around Sharpay's attempts to sabotage Troy's relationship with Gabriella and claim him as her own.

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There's a bit more drama in this one, more conflict and character shading for the supporting characters, particularly Ryan. The songs veer more toward over-produced dance-pop than the charmingly simple, melodic tunes from the original, but there are still plenty of highlights. "What Time Is It" is the best opening number of the entire series, a "school's out" bop that instantly roots the audience back in the squeaky-clean innocence of the franchise. Sharpay's solo, "Fabulous," is an underrated bit of diva pop, and "I Don't Dance" a Damn Yankees-meets-hip hop showcase for Corbin Bleu's Chad and Lucas Grabeel's Ryan, is as instantly catchy as it is an impressive feat of choreography. Of course, the piéce de resistance is Efron's "Bet On It," simultaneously a sublime piece of high camp and a testament to Efron's innate movie star charisma. While it can't quite reach the bubble-gum high of the original ("Humuhumunukunukuapua'a" is a series low point), High School Musical 2 sees Ortega and the cast returning with giddy confidence that's still somehow infectious.

1. High School Musical

High School Musical

It's hard to overstate just how much a bolt from the blue this film really was. In 2006, the Disney Channel Original Movie was a cuddly tradition for young millennials, a weekend event for tweens who were just a hair too young to be out at school dances or riding around town with friends. However, no DCOM had ever performed as well as High School Musical, which debuted at 7.7 million viewers and instantly became a generation-defining phenomenon. It's easy to see why; HSM took the public's renewed interest in movie musicals brought on by films like Moulin Rouge! and Chicago and repackaged it for a younger audience, igniting in them a passion for performance and musical theater that continues to this day.

It's easy to call High School Musical "dumb," but that's missing the point. The entire film is a rejection of the cynical and an embrace of the earnest. It's also an incredibly well-executed story of marching to the beat of your own drum, populated by a diverse and game cast and filled to the brim with non-stop earworms. "Start of Something New," "What I've Been Looking For," Get'cha Head in the Game," "Stick to the Status Quo," and "Breaking Free" are all tuneful, shimmering hits, and "We're All In This Together" instantly became a triumphant anthem of togetherness for the ages. High School Musical taught an entire generation that singing and dancing don't have to be lame, and to this day it still is capable of slapping a smile on viewers' faces from beginning to end.

Next: Why High School Musical 4 Never Happened