Ninja Warrior UK: ITV, 7pm
The nation's bravest (and probably not brightest) contenders are back in the arena to test their strength, speed, and courage in the fourth heat - and this week, they're joined by a Gladiators legend in the form of Saracen (aka Mike Lewis).
Should the contestants pass the first round, the great feat of Mount Midoriyama will be their final challenge, before the successful hopefuls go through to the semi-finals in two weeks' time.
Atlantis: BBC One, 7.45pm
We're nearing the end of the season, and it's getting dark. We see Jason a wrecked shadow of his former self after his discovery, forgoing his care for anyone and everything - Ariadne included.
Pythagoras, ever the friend, sets out to help Jason - but finds out that his desperation is not as dire within the others as he thought.
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Britain's Got Talent: ITV, 8pm
We're still in the auditions round, and like the sneak peek we saw earlier this week, it looks to be a treat.
Simon Cowell, David Walliams, Amanda Holden and Alesha Dixon are back again to judge the talent from every corner in Britain willing to come forward for the chance to win a cash prize and a performing spot at the Royal Variety Performance later this year.
The Following: Sky Atlantic, 9pm
With Joe now behind bars, the Hardy squad aren't expecting his demise to come without a fuss.
Things take a turn for the worse - more so than usual - as Ryan is forced to go into the prison alone as a hostage situation develops. Will Joe's efforts to make a stand be enough?
