Okay:

THE WORLDWAR SAGA by Harry Turtledove
Green alien lizards invade Earth but - here's the catch! - it's 1942 and the planet is in the middle of WW2. Alt-history shenanigans ensue.

THE ARMAGEDDON TRILOGY by Robert Rankin
Aliens seek to invade and destroy Earth. The only thing standing in their way is a resurrected Elvis Presley and his time-travelling alien sidekick Barry, who for reasons too complicated to go into here, can only manifest as a sprout.

KRAKEN by China Mieville
A dead squid is squidnapped from a London museum sparking a major hunt for it across London. A STAR TREK-worshipping mage with a magic wand shaped like a phaser and can do teleportation magic accompanied by the TV show's special effects plays a key role. The female lead is based on Amy Winehouse.

PATIENT ZERO by Jonathan Maberry
A beautiful-but-deadly female geneticist allied to Al-Qaeda creates a plague which can turn people into ravaging zombies and unleashes it in Baltimore. A chisel-jawed hero with more lives than Jack Bauer has to stop it.

TRIUMFF: HER MAJESTY'S HERO by Dan Abnett
A ridiculously flamboyant but morally dubious hero has to save an alternate-history British Empire that was founded by Elizabeth I after she married the King of Spain. His preferred weapon is a Swiss Army Sword that has an unfortunate tendency to deploy corkscrews and butter-knives rather than the needed weapon.

THE HOLLOW CHOCOLATE BUNNIES OF THE APOCALYPSE by Robert Rankin
Rich entrepreneur Humpty Dumpty is found boiled to death in his own swimming pool. Hard-bitten, noir-esque private detective Wee Willie Winkle is called in to solve the murder before the killer can strike at the good folk of Toy City once again.