‘…an accelerator, with protons colliding at massive speeds.’

‘So what?’

‘You have to be the dumbest intergalactic space time inspector I’ve worked with -it caused an unstoppable chain reaction, and destroyed that solar system.’

‘So.’

The third planet had sentient bipeds like us, which is why we need to stop the experiment -I hope we have the date right.

‘Why don’t we ask one of the humans?’

‘Don’t be daft -do you even know how time travel works?’

‘Of course, hang on, here comes one …excuse me, is this before or after the annihilation of humanity?’

‘BOUT TWO MONTHS BEFORE.’