The Lanterns Episode 4 preview reveals that the HBO series would return to Rushville after episode 3's detour. We see Hal interacting with Sinestro at the prison planet. The second episode ended with Hal meeting Sinestro, and we return to that scene in the fourth one, which is titled "The Weenie". It looks like Sinestro in this HBO series is manipulating his former pupil.The 57-second-long preview sees Hal's former mentor wanting the Green Lantern legend to kill John Stewart. It is clear that Sinestro is trying to push his former mentee towards a darker path, hinting at Hal's eventual villainous turn in Lanterns.Will Hal Jordan break bad in Lanterns Episode 4? View this post on Instagram Instagram PostIt is clear from the start that Hal isn't thrilled with the Guardians' decision to recruit John as back-up to him. The trailers have even suggested that Hal is aware that the Guardians consider John as his replacement. In this week's episode, the Guardian Lianna informs John that he will replace Hal, something she thinks the legendary human Green Lantern is not aware of.But the trailers have already revealed that Hal is incensed with John because he sees the young artist as his replacement. Thus, the HBO series might be adapting one of the most controversial Green Lanttern comic books: Emerald Twilight, which was published in 1994. The much-debated comic book storyline saw Hal break bad and kill all the Guardians when they refused to help him revive Coast City, which was destroyed.In the closing minutes of the comic, Hal sucks out all energy from the central battery in Oa, which effectively renders all the Green Lantern rings useless. After doing so, Hal rechristens himself as "Parallax". However, DC retconned Parallax in the early 2000s as a yellow bug entity embodying fear, which possessed Hal and drove him towards villainy.Sinestro in HBO's Lanterns is trying to do something similar as he corrupts Hal with the fear of losing his importance in the episode 4 preview. But this storyline also probably sets up an interesting detail of Hal's death in 2026.Hal might have left the Green Lantern Corps somewhere between 2016 and 2026: View this post on Instagram Instagram PostOne of the shocking moments in the HBO series is Hal Jordan's death in the closing minutes of the first episode. This scene is set in 2026, a decade after John's recruitment to the Green Lantern Corps. We may find out Sinestro manages to convince Hal Jordan to leave the Green Lantern Corps. Thus, the Hal Jordan we saw in 2026 could have been a Yellow Lantern Corps member.The third episode suggests that Hal still looks up to his former mentor. Therefore, Sinestro might manipulate Hal into joining the Yellow Lantern Corps and break bad and kill John Stewart. But we will learn more on next Sunday as the fourth episode drops on HBO.As we wait for the fourth episode, watch the first three episodes of Lanterns, which are accessible through streaming on HBO Max.