Primeverse (aka Maxverse) Bart doesn't kill Gus, and the other universes proceed accordingly, where Gus marries Wendy, has five children, in particular Maxwell who bears a grudge against his father's neglect.
Vietnam AU - The events of Primeverse occur in the 1970s, including Maxwell and Benny being drafted into the army
Cut Finger AU - Gus discovers Max's goop status during some enforced bonding time
Nameswitch AU - In which Benedict and Max are given the opposite names, and the effects thereof
Miscarriage AU - In which Max poisons Alice in order to induce a miscarriage