Sherlock (BBC1, 9pm) Just in case you haven’t been counting down the days until the BBC finally resolved the biggest TV cliffhanger of 2012, the last episode of the acclaimed second series of Sherlock saw the sleuth (Benedict Cumberbatch) apparently committing suicide by throwing himself off the top of a building.

His sidekick Dr John Watson (Martin Freeman) was grief-stricken, but the last shot revealed to viewers that Sherlock was in fact still very much alive – what we didn't know though, was how he’d managed to fake his death. In the two very long years that followed – it must be tough to get Freeman and Cumberbatch’s schedules synchronised now that they’re both in demand for Hollywood blockbusters – fans have had plenty of time to come up with their own theories as to what actually happened.

And now we’re finally about to find out if any of them were right.

As in real life, two years have passed since the devastating events of The Reichenbach Fall, and Watson seems poised on the brink of domestic bliss, even if he does still miss his eccentric former roommate.

So when London is threatened by a terrorist attack and Sherlock dramatically rises from the grave, will Watson be left wishing his friend had just carried on playing dead?

Freeman’s real-life partner Amanda Abbington is Watson’s new love interest, Mary.

Co-creator Steven Moffat says: “It’s been a long time since Sherlock Holmes jumped off that roof – it’s time to reveal the truth about what happened between him and the pavement.”

Weird Nature (BBC2, 8pm) When it comes to the great outdoors, Chris Packham is your go-to man, that’s a no-brainer. What he doesn’t know about the world’s nature, probably isn’t all that worth knowing, so he’s perfectly cast in the presenting role of this new two-parter about nature’s most bizarre happenings and the world’s weirdest animals.

The programme wraps up tonight with a trip to Florida to hear how the fish there are walking out of water. Meanwhile, bees in France have been making shocking multi-coloured honey. Chris explains how whales and dolphins have forged an unlikely friendship, how trees are seeping red blood, and why all over the world, people have been reporting alien-like sounds coming from the sky. And no, you’re not seriously hung-over and having strange visions; these really are some of the weirdest goings-on in the world...

Glasgow Big Night Out (BBC2, 9pm) Cast your mind back to last year, and you may remember the documentary Blackpool’s Big Night Out, which looked at how the Lancashire coastal town was at the heart of English entertainment, attracting global superstars and helping to launch the careers of British performers.

Well, now it’s the turn of Glasgow to get the same treatment in this programme, narrated by Glaswegian actor, impressionist and entertainer Stanley Baxter. During the heyday of variety, audiences at the city’s famous venue, the Empire, had a reputation for toughness, especially when it came to English comedians — showbiz legend has it that even Morecambe and Wise initially struggled to win over the hostile crowd.

But as Baxter points out, many acts made their name there, ranging from Nicholas Parsons to the Krankies.

And international stars, including Dean Martin and Jerry Lewis, Laurel and Hardy, Roy Rogers and Trigger, Harry Houdini and Danny Kaye were always guaranteed a warm welcome.

David Blaine: Real or Magic (Channel 4, 9pm) These days, when it comes to street magic, Dynamo is the name on everybody’s lips, but let's not forget who’d already been there, done that and wowed the crowds years before.

Almost as if he’s heard our thoughts, David Blaine returns to show off his signature brand of magic once more. He began his career as a magician who appeared to do the impossible with a deck of cards, but was soon following in the footsteps of Houdini, attempting the physically impossible – and seemingly achieving it (remember the ice block stunt in Times Square?). For this one-off programme, he’s roped in some of his famous friends and is attempting more of his fascinating tricks. He manages to stun some of the most recognisable celebrities in the world, including Jamie Foxx, Katy Perry and Will Smith. He also visits the homes of Kanye West, Harrison Ford and Olivia Wilde and visits Stephen Hawking at his office.