Canonically one of the key characters in the comics Doom Patrol, many fans were surprised that although the Doom Patrol was introduced in an episode of Titans, Beast Boy chose to leave them behind. Although the Doom Patrol series is technically a Titans spin-off, the show hasn't made mention of Beast Boy since his exit.

In an ironic twist, Vic Stone/Cyborg was introduced to the Doom Patrol series shortly after Titans began airing. Cyborg is a classic member of the Teen Titans but has not made an appearance on the show yet — could this leave room for a crossover soon?

Titans and Doom Patrol are streaming on HBO Max.