An investigation reveals that Megabyte has become a Trojan Horse virus, which gives him the power to shapeshift and effectively disguise himself as anyone. It is also revealed that Megabyte had inadvertently stolen part of Bob's Guardian code when he crushed Glitch at the end of Season 2, and he used that code to impersonate him until Glitch returned it to the real Bob during the wedding. Meanwhile, Megabyte starts disguising himself as other Mainframers, including Mike the TV, and reassembles his viral army.
This sequence of events is uncovered through an investigation that reveals Megabyte has transformed into a Trojan Horse virus, allowing him to alter his appearance and convincingly impersonate anyone. It is also discovered that Megabyte had unintentionally stolen part of Bob's Guardian code when he defeated Glitch at the end of Season 2, and he used this code to pretend to be Bob until Glitch returned it to the real Bob during their wedding ceremony. Concurrently, Megabyte begins disguising himself as other Mainframers, including Mike the TV, and reassembles his viral army.