What does the third umpire check on every wicket?

Front-foot no balls, every ball: the third umpire watches replays of the bowler's feet landing on every delivery. If the back foot touched or landed outside the return crease, or no part of the front foot landed behind the popping crease, they tell the bowler's end umpire, who calls and signals No ball straight away. So this check has already been done before any wicket is reviewed.

On a referral or review of a dismissal, the third umpire first checks that the delivery was fair (other no-ball types, such as height), apart from whether the bowler's action is legal. If it was a no ball, the batter is Not out.

Then the dismissal itself, for example:

• Caught: did the batter hit the ball, and was the catch clean (not a bump ball)?
• LBW: did the ball hit the bat first, then the ball-tracking checks for landing, impact and hitting the stumps.
• Run out, stumped, bowled, hit wicket: when the wicket was broken and whether the batter was in their ground.

If the third umpire sees the batter is out another way (or not out by any mode), they must say so. Any other mode is judged using the on-field umpire's original decision as the starting point.

The batter can be asked to wait at the crease while the on-field umpire checks the fairness of the delivery after a dismissal. If a no ball is found, the batting side gets the no-ball run and the dismissal is cancelled, but no other runs from that ball.