Roswell, New Mexico — a reboot of a WB/UPN series from the early 2000s — debuts on the network Tuesday, January 15, at 9 p.m. As a result, Black Lightning (currently in its second season) will follow Arrow on Mondays at 9 p.m., starting on January 21; Arrow's on at 8 p.m. Legends of Tomorrow will take Black Lightning's spot on Monday nights when the latter's second season is done airing in April (meaning Legends will go on hiatus for a bit in between).
Another new series is In The Dark, a crime drama about a blind woman trying to solve a murder. The show is set to debut on Thursday evenings once Legacies finishes up its first season. An order for three more episodes of Legacies was placed last week, bringing its total episode count to 16.
Returning shows like Jane the Virgin (entering its fifth and final season) will premiere on Wednesday nights after the Season 1 closer of All American, whose episode order, like Legacies, was also boosted to 16 with three more ordered.
As for the shows currently on the air, we've also got their midseason return dates. During the week, The Flash runs back onto the airwaves on Tuesday, January 15, at 8 p.m.; Riverdale ramps up the drama on Wednesday, January 16, at 8 p.m.; and Supernatural returns Thursday, January 17, at p.m. Sunday, January 20, marks the midseason premieres of Supergirl and Charmed at 8 p.m. and 9 p.m., respectively.