Frisky Dingo/WMG

Frisky Dingo, Sealab 2021, and Archer all take place in the same world
Frisky Dingo and Archer take place at the same time (kinda like GTA IV and its 2 DLC games) and somewhere along the line caused Sealab 2021 to happen. Adam Reed's next show will fill in the 11-13 years following the other 2.

Xander Crews, Archer, and Murphy are all related
They all have the same sort of personality and roughly the same IQ.