No.89002387 ViewReplyOriginalReport
CN rushed the final Regular Show season so hard that they haven't even finished the final work on the finale yet.

So basically it's airing as soon as it's completed next Monday. That's the reason it's airing on a Monday during a Teen Titans all day marathon, instead of at a better time like on the Network Premiere day Thursday, which has no new episodes that week so it would've been a perfect placement.