Allen, 20, replaces the injured Jonathan Davies in the midfield.
"Saturday will be a huge occasion for Gethin (Jenkins) and a fantastic milestone," coach Warren Gatland said on Thursday.
"We have made a number of changes due to injury but it's a great opportunity for players we have been very impressed with. For Cory (Allen) it will be his first taste of international rugby and for Rhodri (Jones) a chance to gain more experience.
"Justin (Tipuric) played very well off the bench last weekend (against South Africa).
"At fly-half it was always our intention to give Dan (Biggar) and Rhys (Priestland) one game each at the start of the series and it's Dan chance this weekend."
Wales: 15-Leigh Halfpenny, 14-George North, 13-Cory Allen, 12-Scott Williams, 11-Liam Williams, 10-Dan Biggar, 9-Mike Phillips, 8-Toby Faletau, 7-Sam Warburton (captain), 6-Justin Tipuric, 5-Alun Wyn Jones, 4-Bradley Davies, 3-Rhodri Jones, 2-Richard Hibbard, 1-Gethin Jenkins.
Replacements: 16-Ken Owens, 17-Paul James, 18-Samson Lee, 19-Luke Charteris, 20-Ryan Jones, 21-Lloyd Williams, 22-James Hook, 23-Ashley Beck
(Reporting by Ossian Shine, editing by Justin Palmer)
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