Let's not waste any time. Here's the conclusion of Teen Titans' 5th season opener, "Homecoming", marking the animated debut of the Doom Patrol.
All in all, it was predictable, and it certainly suggested that this was a backdoor pilot for a possible DP series, but Cartoon Network didn't take a chance. All that was missing was the DP's founder and original leader, Niles Caulder.
In the books, Steve Dayton (Mento) was the adoptive father of Gar Logan, aka Beast Boy, whose other identity hadn't been revealed on this show until this episode. As we've documented, the warped minds behind this series opted to give Gar a more bestial appearance, which hasn't improved much in the six years since Teen Titans Go! launched. If you want the "real" Gar, check out the DC Super Hero Girls shorts available On Demand or online, or the graphic novels in the series from DC.