HBO's 'Lanterns' episode 3, which premiered on August 30, 2026, includes a Janus Cosmetics storefront sign that links to the DC Comics character Roman Sionis, known as Black Mask, and may relate to the forthcoming Clayface film.

Janus Cosmetics is a fictional company owned by the Sionis family in DC Comics; Roman Sionis inherited the business after his parents' deaths and later became Black Mask, a Gotham crime lord first portrayed by Ewan McGregor in the 2020 film 'Birds of Prey'. The character exists in the previous DC Extended Universe, which is separate from the continuity overseen by James Gunn. In the comics, the company is also tied to the origin of Matt Hagen, the actor who becomes Clayface after a cosmetic treatment goes wrong.

In episode 3, the scene takes place in an abandoned shopping mall where the protagonist John Stewart, a Green Lantern in training, is questioned by a Guardian of the Universe. A large Janus Cosmetics sign is visible across the mall corridor, though the character does not interact with the storefront. An Entertainment Weekly interview from July noted that the Clayface movie will combine elements of multiple origin stories, emphasizing body horror over traditional supervillain traits.

The show's creator has not confirmed a direct connection between the sign and any future Clayface storyline. Some fans interpret the sign as a tease for Black Mask's return or for Clayface, while the series has not provided official confirmation. The episode otherwise focuses on John Stewart's backstory and the interview segment.

Whether the Janus Cosmetics sign serves as a narrative hint or a mere decorative detail remains unresolved.