There are myriad quantum possibilities, whole universes existing just a molecular vibration away from our own, worlds where things are very different and others where they're almost the same. In what we call "Whoniverse-B", the Doctor's adventures are just a touch different...
In the Whoniverse-B, the Ice Lord Slaar called a media conference on the Moon to deliver his ultimatum to humanity.
That universe's third Doctor was a little more violent, quite willing to use automatic weapons against his enemies.
Anyone else remember Doctor Who's sole musical episode? It WOULD have to happen on Colin Baker's alt-shift.
Don't worry, though Doctor 7-B was assimilated by the Cybermen, he got better.
Whoniverse-B's UNIT are a little more trigger-happy, as the Doctor and Craig found out in the night.
We now rejoin our own reality, already in progress...