I don't remember if this was posted here as news two years ago when it was first found (I didn't want to waste time searching), but there was a second standby comic issue done up based on a cartoon episode... but unlike Big Broadcast of 2006, this one didn't end up being needed (produced just in case they were running late for the month's deadline, just needing a quick splash of colour - which is a lot of work to not be needed, and probably annoying to the artists who never saw it in the hands of fans).
The episode was Dweller from the Depths (the one about the vampire monster released from the centre of Cybertron), and three pages of the black-and-white inks was found in 2015 from the Marvel artist Dave Hunt.