Forbidden Crossing, Part II

A select group of Corps of Engineers are brought onto the Phoenix-X to fix the ship's Ultra-Transwarp capability. Meanwhile, Q makes a surprise visit in anticipation for what Captain Cell is going to be doing next - only, Cell isn't aware of what he's going to be doing next. Before too long the drive is corrected and the crew are met with a mysterious figure from their past...

Background information

 * This episode pays tribute to several non-canon stories and fan-productions on the subject of Andromeda, by making references to events in each, obscure or otherwise:
 * Captain's Peril - on reference to the Totality
 * Star Trek II Short Stories: "To Wherever" - on reference to V'Ger
 * TOS novelization of Star Trek II: The Wrath of Khan - on reference the USS Magellanic Clouds.
 * Star Trek: Odyssey - on reference to the USS Odyssey
 * The end of episode hints at possible events that took place in the The Q Continuum series.
 * Mayhem takes on a small version of the Iconian virus as part of his program.
 * Beck returns as a side character. He was last seen in "Departments".
 * Q takes Cell's powers away a second time. They were given to Cell for the second time in "Power Levels". Q also informs Cell of the existence of the X Continuum.
 * When Seifer tells Mayhem that the Starfleet crash course programs were deleted by the "previous virus hologram", he is referring to Amp.
 * This is the latest episode of.