A time experiment in the 1950s sends a bizarre monster to Ben's time. Now Ben, Gwen, and Kevin must team up with Paradox, a time traveling hero, to face off against the unstoppable creature.

A dragon escapes from the Forever Knights, and they ask Ben for help tracking down/killing the beast. The team learns why the Knights were formed. The hunt for the dragon reveals other surprises.

Two Plumber offspring are taking down all aliens. Now they have their sites set on Ben's team, forcing the team to fight two of Ben's old alien forms - Four Arms and XLR8.