How is Wheeljack still alive in the second series?
A letters page glibly explained that, all appearances to the contrary, he didn’t die at the end of the first series, and was patched up by Ratchet off-panel, despite Ratchet being not too far off dead himself at the time. So the actual answer is that Brad Mick didn’t think Wheeljack should have been killed off, and that’s about all there is to it. It should be noted, though, that people can say whatever they like in letters pages, interviews and editorials, but it still isn’t actually fact if it’s not backed up by the comics. Initially it was taken by some fans as an attempt to restart the Dreamwave continuity, but direct references to the first series later on blow this clean out of the water.