Morgan was first introduced to the World Wrestling Federation when he entered as part of its Tough Enough II program, but left the show early due to an injury.
Morgan made his WWE debut on the October 30, 2003 episode of SmackDown! and was chosen with the returning Nathan Jones by then-General Manager of SmackDown!, Paul Heyman, to join Team Lesnar, which consisted of Matt Morgan, Nathan Jones, Brock Lesnar, Big Show and A-Train. It was hinted that Matt Morgan and Nathan Jones would be a tag team, but their only tag team match was at the 2003 Survivor Series pay-per-view, when they took on Team Angle (not the stable introduced one year earlier, but a one-off combination of five wrestlers). They lost to Team Angle in a ten-person elimination tag team match at 2003 Survivor Series; Morgan was eliminated from the match by Kurt Angle after Angle gave Morgan an Angle Slam. Morgan was then used to make run-ins along with the other members of Team Lesnar, helping Brock Lesnar against his opponents.
Soon thereafter, Nathan Jones quit WWE, so Matt Morgan occasionally teamed with Lesnar. He teamed up with Lesnar, Big Show, and Rhyno in a four-on-two handicap match against Chris Benoit and John Cena on the January 22, 2004 episode of SmackDown!, in a losing effort. On January 25, he competed in the 2004 Royal Rumble match, in which the winner would get a title shot against their brand's champion at WrestleMania XX; he got rid of The Hurricane but was eliminated by Chris Benoit.
Morgan returned to WWE on the April 21, 2005 episode of SmackDown!, with a new gimmick as a stuttering big-man who was defensive over his speech disorder, and quickly defeated a then-unknown jobber, Brett Matthews. On the May 19 episode of SmackDown!, he allied himself with Carlito Caribbean Cool and became his "backup". Morgan helped Carlito defeat Big Show at Judgment Day, using Lesnar's former finisher, the F-5. The partnership ended when Carlito was drafted to Raw, and Morgan was subsequently released by WWE on July 5, 2005. His last match in WWE was on the July 7 episode of SmackDown! against William Regal, although technically the match never took place as Morgan was attacked by The Mexicools before Regal ever got to the ring.