Colchester have one minute - plus whatever is added - to force a penalty shootout.

They've won a free-kick...

Randell Williams still has some zip to his play - the Exeter winger dribbles inside from the right flank and bends one wide.

Colchester need to summon all their energy for one last chance.

They take off Kwame Poku, with former Plymouth player Paris-Cowan Hall coming on.

Colchester skipper Luke Prosser has made a heroic block from a Ryan Bowman strike and seems to be feeling the effects.

But he's limping on for now.

Exeter aren't resting on their laurels and seem intent on going for another goal late on.

Exeter have been in the League Two play-offs three times in the past four seasons and on each occasion they've scored three goals in the semi-final second leg.

Not a bad record, even if their record at Wembley isn't the best.

What have Colchester got left?

Aaron Martin tries to find Jayden Richardson down the left but the pass is sloppy and flies out for a Colchester goal kick.

The pace has fallen a tad as we enter the final 10 minutes.

Exeter's Jayden Richardson takes a bang on the head from Theo Robinson but seems OK to continue.

The clock is ticking and maybe both sides are more worried about giving anything away than they are about making something happen.

The second half of extra time is off and running.

Tired legs, tired minds - who can make the difference here?

Image source, Rex Features

A reminder that in around half an hour, we've got more knockout football to look forward to in tonight's other League Two play-off semi-final second leg.

Cheltenham hold a two-goal lead against Northampton and could seal their place in next week's final at Wembley.

Or will Northampton force extra time in that tie, too? Kick-off comes after this tie is wrapped up.

Half-time in extra time.

Still nothing to separate the sides over 195 minutes.

We're 15 minutes away from the first penalty shootout since the return of English football - if that's not enough reason to stay with us, I don't know what is!

One minute added on at the end of this first half of extra time.

Image source, Getty Images

Exeter remain the stronger side in this first half of extra time.

This time Nigel Atangana lets fly from 25 yards and it's not too far from Dean Gerken's far post.

Tony Liddell: The cardboard cut outs in the stand look like a massive game of Guess Who

Slowbear: Whatever happens I just hope this tie isn't decided on penalties - there is no harsher way to 'Exeter' competition!

Image source, PA Media

Ryan Bowman just can't adjust his body quick enough to divert that in!

His Exeter team-mate Brennan Dickenson fires the ball across goal and Bowman is completely free in the box but can only knee the ball wide.

Big chance.

There are two Colchester players on the deck - subs Theo Robinson and Courtney Senior. Both are OK.

The visitors use the stoppage to bring on Tom Lapslie and Miles Welch-Hayes for Ben Stevenson and Ryan Jackson

Kwame Poku has a pop from the edge of the box but it hits his Colchester team-mate Harry Pell and Exeter win a free-kick to get some respite.

Surely the tempo will drop soon as these ring-rusty players get a bit knackered?

Home boss Matt Taylor is a tactical tinkerer and seems to have changed his side's shape after their shaky end to normal time.

They've started extra time on a brighter note but there will be several twists and turns yet.

Exeter win a couple of corners to build pressure and the second is headed well off-target by Dean Moxey.

The hosts now make a couple changes - Tom Parkes and former Colchester player Brennan Dickenson on for veterans Dean Moxey and Nicky Law.

Here we go then.

Barely enough time for a comfort break and we're back under way for the first half of extra time.

Can Exeter stem the Colchester tide?

Right then, which way is this tie heading? We're in for at least another half an hour and, of course, possibly the dreaded penalties too.

Stick with us for the lot.