As the Maximal and Autobots head for the Allspark, Optimus Prime goes ahead before Megatron. Meanwhile, the other Maximals and Autobots discuss the Allspark and that's where Steven comes in about their share of encounters with it back in California.
Steven: "We had our fair share with the Allspark back in California."
[...]
Phoebe: "Oh, forget this! Humans, Maximals. Maximals, Humans. Anyway, we need that to get home."