I like it...
Wells in cahoots with Tempus....

I was also thinking that Penny might have had some ulterior motive for seeking our favourite boy in blue for her beau... (4.16)

or

if set any time before the fated finale FAMILY HOUR...
ALICE could be the perfect jealous spouse (either ex- or current spouse) and then seek revenge by blowing up the planet... between S3 and 4
or
she could blow up the planet as a ruse to get/keep Perry home if they have not yet separated...
huh huh
think about it
it works perfectly
even better than my cannabis scenario

You can't have MANSLAUGHTER without LAUGHTER

The Neuroscientist: Eating glass makes you smart...do you want to see what you can learn?