(1984): One of her most recognizable works, which showcased the gritty, provocative style of the mid-80s. Materyales Fuertes

Myrna Castillo's filmography is a testament to the bold and often gritty landscape of '80s Philippine cinema. Her work was largely defined by her frequent collaboration with the maverick director , a filmmaker ranked alongside legends like Lino Brocka for bringing about the Second Golden Age.

| Year | Title | Notes | |------|-------|-------| | 1982 | Palparan ng Dila | One of her most notorious bold films; marketed as a sexploitation drama. | | 1983 | Uhaw na Hayop | Combines social commentary with explicit scenes. | | 1984 | Virgin People | Ensemble cast; Myrna plays a sexually liberated character. | | 1985 | Bomba Star | Meta-narrative about the adult film industry itself. | | 1986 | Gabi ng Lagim, Gabi ng Kalibugan | Horror-erotica hybrid (common 80s Pinoy subgenre). |

Considered the holy grail among collectors, Hubad na Ginto cast Myrna C. as a mining town prostitute who seduces a foreign engineer. The film featured a notorious 12-minute "pene sequence" shot in a single take—legendary in underground circles. Myrna C. performed her own stunts and, according to director Ben Yalung (a pseudonym), "never said no to the script."