Megabyte uses propaganda to make the Mainframers doubt Enzo's capability of defending the system, prompting Phong to make Enzo, AndrAIa, and Mouse into a team to go into Games and win them without help from Dot in order to give Enzo a better image.
The third episode of the first season. After Bob wrestles a deadly magnet away from Megabyte, an accident puts Dot in serious danger if she can't get slow food fast.
Clips of Hexadecimal's capture by Megabyte. Note the theme of sadomasochism, something only possible for the creators to depict when the characters involved are both villains. I'm a little surprised how much they got in there.
The fourth episode of the second season. Megabyte tries to steal energy from the Principal Office, and the resulting chase continues into a Mad Max-style Game.
The eighth episode of season one. When Enzo feels stupid, he tries to become smarter by accessing a program in the Principle Office and making some changes to the system, but accidentally makes everyone else (except Phong?) into idiots.
The twelfth episode of the first season. Dot tries to liberate Mainframe citizens from Megabyte's tyrannical rule, but might inadvertently make things worse.
The Web creature opened a portal to the Web over Mainframe, and now when the Web threatens to overtake Mainframe, the Principal Office joins together with Megabyte and Hexadecimal to defend their system from invasion.