It's the start of the week, you need something to lift your spirits. Thankfully there's plenty of educational and entertaining fare on offer tonight.
'Forces of Nature with Brian Cox' 9pm, BBC One
In the second episode of this new series, former D:Ream keyboard player and physicist Dr. Brian Cox hops aboard a fighter jet to race against the rotation of the Earth and see if he can reverse the passage of a day. A bit like at the end of the original 'Superman' film.
We also see a pro surfer ride a huge wave up the Amazon River, and Cox explains how understanding the motion and speed of Earth helps us understand the nature of space and time. Like his other series, you can bet this will be educational and highly entertaining.
'David Attenborough's Galapagos' 8pm, Sky 1
Attenborough might be a staple of the BBC, but his series for Sky have also been rather illuminating.
In this series, he returns to the Galapagos islands, and shares with us the first-ever shots of the pink iguana, as well as the last-ever footage of the now-deceased Lonesome George, the Pinta Island tortoise that's been dubbed the rarest creature in the world.
Life on the islands has evolved in complete isolation, so the area is home to species that don't exist anywhere else in the world. At 86 years old, Attenborough's enthusiasm remains undimmed, and his programmes as compelling as ever.
Star Trek II: The Wrath of Khan 9pm, Syfy
Out of all of the 'Star Trek' films to date, plenty of fans consider this the best.
Khan (Ricardo Montalban) has been sent to a planetary wasteland, and he's not happy about it: for revenge, he hijacks a starship and targets Kirk and co aboard the Enterprise. It might lack some of the pizzaz of the JJ Abrams-era films, but in terms of story and character it's up there with the best sci-fi around.
And many think that the original cast of William Shatner, Leonard Nimoy, DeForest Kelley, James Doohan and Walter Koenig has never been bettered.