Full-time from The Den
Neil Harris' U21s booked their place in the next round of the League Cup following a dramatic penalty shoot-out win against Colchester United at The Den on Monday night.
Powell almost snatched victory right at the death with a low angled drive that flashed just past the upright with Bransgrove stranded, and penalties followed.
With both teams tiring, a long forward ball from Powell was intercepted by keeper Bransgrove, who sprinted off his line to clear with Philpot racing through on goal as the game entered the final five minutes.
Home keeper King was called into action twice in the first period of extra time, first getting his body behind a fierce drive from Lawrence and then superbly tipping Kane Vincent Young's goalbound effort onto the bar and over for a rare Colchester corner.
The Lions had a couple of opportunities too with Dylan Casey's bullet header flashing narrowly wide following a super passage of play and Ben Thompson scooping over after the ball bobbled just as he was about to connect from close-range, but neither team could find that second goal and the game headed into extra-time.
Three times Bonne was in great positions but fired high, then wide in a one on one with King before the keeper spread himself brilliantly to avert the danger with a brave block five minutes from time.
It was Colchester - and Macauley Bonne in particular - who were left to rue what might have been in the second half as the visitors created the clearer chances.
The U's grew in confidence and it took a fine save by Lions keeper Tom King to parry Dominic Vose's drive just before half-time to ensure the sides went in level at the break.
Bransgrove, Vincent-Young, O'Donoghue, Okuonghae, Lokko, Lawrence, Vose, Bonne (Hubble, 91mins), Lapslie, Curtis, Smith. Subs not used: Carroll, Roast, Brampton. Colchester United:
Powell (13mins) Scorer:
King, Siafa, Casey, El Bekri (Rylah, 94mins), Goodman, Shittu, Powell, Thompson (Wood, 104mins), Philpot, Onyedinma (Farrell, 75mins), Gueye. Subs not used: Webb, Girling.