Night Nurse and the Dead Boy Detectives made their first live action TV appearances in the third season of Doom Patrol.
Neil Gaiman, who created the Dead Boy Detectives as part of Sandman #25, wrote three scenes for the first season. The episodes containing these scenes are episodes 1, 7 and 8.
The Dead Boy Detectives are originally from the Sandman Universe, first appearing in Sandman #25
Ruth Connell is the only actor from the original Doom Patrol crossover episode to reprise her role for this series (Night Nurse).
This show is technically a spin off of Doom Patrol (2019), as the characters made their first television appearance in the third season. However, with the pivot of the Max streaming service away from original content, the series was purchased by Netflix, as they already produced The Sandman (2022), which takes place in the same comics universe as Dead Boy Detectives (and both titles were originally created by Neil Gaiman.)